mirror of
https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-11-27 13:53:31 +01:00
Split threading-related code out of compat.c
Also, re-enable the #if'd out condition-variable code. Work queues are going to make us hack on all of this stuff a bit more closely, so it might not be a terrible idea to make it easier to hack.
This commit is contained in:
Nick Mathewson
parent
518b0b3c5f
commit
c2f0d52b7f
@ -393,6 +393,10 @@ fi
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AC_SEARCH_LIBS(pthread_create, [pthread])
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AC_SEARCH_LIBS(pthread_detach, [pthread])
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AM_CONDITIONAL(THREADS_WIN32, test "$enable_threads" = "yes" && test "$bwin32" = "true")
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AM_CONDITIONAL(THREADS_PTHREADS, test "$enable_threads" = "yes" && test "$bwin32" = "false")
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AM_CONDITIONAL(THREADS_NONE, test "$enable_threads" != "yes")
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dnl -------------------------------------------------------------------
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dnl Check for functions before libevent, since libevent-1.2 apparently
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dnl exports strlcpy without defining it in a header.
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@ -2544,109 +2544,6 @@ get_uname(void)
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* Process control
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*/
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#if defined(USE_PTHREADS)
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/** Wraps a void (*)(void*) function and its argument so we can
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* invoke them in a way pthreads would expect.
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*/
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typedef struct tor_pthread_data_t {
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void (*func)(void *);
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void *data;
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} tor_pthread_data_t;
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/** Given a tor_pthread_data_t <b>_data</b>, call _data->func(d->data)
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* and free _data. Used to make sure we can call functions the way pthread
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* expects. */
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static void *
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tor_pthread_helper_fn(void *_data)
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{
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tor_pthread_data_t *data = _data;
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void (*func)(void*);
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void *arg;
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/* mask signals to worker threads to avoid SIGPIPE, etc */
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sigset_t sigs;
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/* We're in a subthread; don't handle any signals here. */
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sigfillset(&sigs);
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pthread_sigmask(SIG_SETMASK, &sigs, NULL);
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func = data->func;
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arg = data->data;
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tor_free(_data);
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func(arg);
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return NULL;
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}
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/**
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* A pthread attribute to make threads start detached.
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*/
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static pthread_attr_t attr_detached;
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/** True iff we've called tor_threads_init() */
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static int threads_initialized = 0;
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#endif
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/** Minimalist interface to run a void function in the background. On
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* Unix calls fork, on win32 calls beginthread. Returns -1 on failure.
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* func should not return, but rather should call spawn_exit.
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*
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* NOTE: if <b>data</b> is used, it should not be allocated on the stack,
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* since in a multithreaded environment, there is no way to be sure that
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* the caller's stack will still be around when the called function is
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* running.
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*/
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int
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spawn_func(void (*func)(void *), void *data)
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{
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#if defined(USE_WIN32_THREADS)
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int rv;
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rv = (int)_beginthread(func, 0, data);
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if (rv == (int)-1)
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return -1;
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return 0;
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#elif defined(USE_PTHREADS)
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pthread_t thread;
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tor_pthread_data_t *d;
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if (PREDICT_UNLIKELY(!threads_initialized))
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tor_threads_init();
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d = tor_malloc(sizeof(tor_pthread_data_t));
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d->data = data;
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d->func = func;
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if (pthread_create(&thread,&attr_detached,tor_pthread_helper_fn,d))
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return -1;
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return 0;
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#else
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pid_t pid;
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pid = fork();
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if (pid<0)
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return -1;
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if (pid==0) {
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/* Child */
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func(data);
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tor_assert(0); /* Should never reach here. */
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return 0; /* suppress "control-reaches-end-of-non-void" warning. */
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} else {
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/* Parent */
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return 0;
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}
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#endif
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}
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/** End the current thread/process.
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*/
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void
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spawn_exit(void)
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{
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#if defined(USE_WIN32_THREADS)
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_endthread();
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//we should never get here. my compiler thinks that _endthread returns, this
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//is an attempt to fool it.
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tor_assert(0);
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_exit(0);
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#elif defined(USE_PTHREADS)
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pthread_exit(NULL);
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#else
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/* http://www.erlenstar.demon.co.uk/unix/faq_2.html says we should
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* call _exit, not exit, from child processes. */
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_exit(0);
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#endif
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}
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/** Implementation logic for compute_num_cpus(). */
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static int
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compute_num_cpus_impl(void)
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@ -2935,280 +2832,6 @@ tor_gmtime_r(const time_t *timep, struct tm *result)
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}
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#endif
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#if defined(USE_WIN32_THREADS)
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void
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tor_mutex_init(tor_mutex_t *m)
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{
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InitializeCriticalSection(&m->mutex);
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}
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void
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tor_mutex_uninit(tor_mutex_t *m)
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{
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DeleteCriticalSection(&m->mutex);
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}
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void
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tor_mutex_acquire(tor_mutex_t *m)
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{
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tor_assert(m);
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EnterCriticalSection(&m->mutex);
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}
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void
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tor_mutex_release(tor_mutex_t *m)
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{
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LeaveCriticalSection(&m->mutex);
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}
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unsigned long
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tor_get_thread_id(void)
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{
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return (unsigned long)GetCurrentThreadId();
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}
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#elif defined(USE_PTHREADS)
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/** A mutex attribute that we're going to use to tell pthreads that we want
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* "reentrant" mutexes (i.e., once we can re-lock if we're already holding
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* them.) */
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static pthread_mutexattr_t attr_reentrant;
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/** Initialize <b>mutex</b> so it can be locked. Every mutex must be set
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* up with tor_mutex_init() or tor_mutex_new(); not both. */
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void
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tor_mutex_init(tor_mutex_t *mutex)
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{
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int err;
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if (PREDICT_UNLIKELY(!threads_initialized))
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tor_threads_init();
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err = pthread_mutex_init(&mutex->mutex, &attr_reentrant);
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if (PREDICT_UNLIKELY(err)) {
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log_err(LD_GENERAL, "Error %d creating a mutex.", err);
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tor_fragile_assert();
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}
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}
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/** Wait until <b>m</b> is free, then acquire it. */
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void
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tor_mutex_acquire(tor_mutex_t *m)
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{
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int err;
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tor_assert(m);
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err = pthread_mutex_lock(&m->mutex);
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if (PREDICT_UNLIKELY(err)) {
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log_err(LD_GENERAL, "Error %d locking a mutex.", err);
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tor_fragile_assert();
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}
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}
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/** Release the lock <b>m</b> so another thread can have it. */
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void
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tor_mutex_release(tor_mutex_t *m)
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{
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int err;
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tor_assert(m);
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err = pthread_mutex_unlock(&m->mutex);
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if (PREDICT_UNLIKELY(err)) {
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log_err(LD_GENERAL, "Error %d unlocking a mutex.", err);
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tor_fragile_assert();
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}
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}
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/** Clean up the mutex <b>m</b> so that it no longer uses any system
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* resources. Does not free <b>m</b>. This function must only be called on
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* mutexes from tor_mutex_init(). */
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void
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tor_mutex_uninit(tor_mutex_t *m)
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{
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int err;
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tor_assert(m);
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err = pthread_mutex_destroy(&m->mutex);
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if (PREDICT_UNLIKELY(err)) {
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log_err(LD_GENERAL, "Error %d destroying a mutex.", err);
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tor_fragile_assert();
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}
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}
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/** Return an integer representing this thread. */
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unsigned long
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tor_get_thread_id(void)
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{
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union {
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pthread_t thr;
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unsigned long id;
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} r;
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r.thr = pthread_self();
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return r.id;
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}
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#endif
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/** Return a newly allocated, ready-for-use mutex. */
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tor_mutex_t *
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tor_mutex_new(void)
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{
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tor_mutex_t *m = tor_malloc_zero(sizeof(tor_mutex_t));
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tor_mutex_init(m);
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return m;
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}
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/** Release all storage and system resources held by <b>m</b>. */
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void
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tor_mutex_free(tor_mutex_t *m)
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{
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if (!m)
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return;
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tor_mutex_uninit(m);
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tor_free(m);
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}
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/* Conditions. */
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#ifdef USE_PTHREADS
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#if 0
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/** Cross-platform condition implementation. */
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struct tor_cond_t {
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pthread_cond_t cond;
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};
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/** Return a newly allocated condition, with nobody waiting on it. */
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tor_cond_t *
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tor_cond_new(void)
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{
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tor_cond_t *cond = tor_malloc_zero(sizeof(tor_cond_t));
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if (pthread_cond_init(&cond->cond, NULL)) {
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tor_free(cond);
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return NULL;
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}
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return cond;
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}
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/** Release all resources held by <b>cond</b>. */
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void
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tor_cond_free(tor_cond_t *cond)
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{
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if (!cond)
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return;
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if (pthread_cond_destroy(&cond->cond)) {
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log_warn(LD_GENERAL,"Error freeing condition: %s", strerror(errno));
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return;
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}
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tor_free(cond);
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}
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/** Wait until one of the tor_cond_signal functions is called on <b>cond</b>.
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* All waiters on the condition must wait holding the same <b>mutex</b>.
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* Returns 0 on success, negative on failure. */
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int
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tor_cond_wait(tor_cond_t *cond, tor_mutex_t *mutex)
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{
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return pthread_cond_wait(&cond->cond, &mutex->mutex) ? -1 : 0;
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}
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/** Wake up one of the waiters on <b>cond</b>. */
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void
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tor_cond_signal_one(tor_cond_t *cond)
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{
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pthread_cond_signal(&cond->cond);
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}
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/** Wake up all of the waiters on <b>cond</b>. */
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void
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tor_cond_signal_all(tor_cond_t *cond)
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{
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pthread_cond_broadcast(&cond->cond);
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}
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#endif
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/** Set up common structures for use by threading. */
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void
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tor_threads_init(void)
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{
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if (!threads_initialized) {
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pthread_mutexattr_init(&attr_reentrant);
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pthread_mutexattr_settype(&attr_reentrant, PTHREAD_MUTEX_RECURSIVE);
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tor_assert(0==pthread_attr_init(&attr_detached));
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tor_assert(0==pthread_attr_setdetachstate(&attr_detached, 1));
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threads_initialized = 1;
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set_main_thread();
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}
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}
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#elif defined(USE_WIN32_THREADS)
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#if 0
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static DWORD cond_event_tls_index;
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struct tor_cond_t {
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CRITICAL_SECTION mutex;
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smartlist_t *events;
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};
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tor_cond_t *
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tor_cond_new(void)
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{
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tor_cond_t *cond = tor_malloc_zero(sizeof(tor_cond_t));
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InitializeCriticalSection(&cond->mutex);
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cond->events = smartlist_new();
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return cond;
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}
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void
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tor_cond_free(tor_cond_t *cond)
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{
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if (!cond)
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return;
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DeleteCriticalSection(&cond->mutex);
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/* XXXX notify? */
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smartlist_free(cond->events);
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tor_free(cond);
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}
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int
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tor_cond_wait(tor_cond_t *cond, tor_mutex_t *mutex)
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{
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HANDLE event;
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int r;
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tor_assert(cond);
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tor_assert(mutex);
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event = TlsGetValue(cond_event_tls_index);
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if (!event) {
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event = CreateEvent(0, FALSE, FALSE, NULL);
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TlsSetValue(cond_event_tls_index, event);
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}
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EnterCriticalSection(&cond->mutex);
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tor_assert(WaitForSingleObject(event, 0) == WAIT_TIMEOUT);
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tor_assert(!smartlist_contains(cond->events, event));
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smartlist_add(cond->events, event);
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LeaveCriticalSection(&cond->mutex);
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tor_mutex_release(mutex);
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r = WaitForSingleObject(event, INFINITE);
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tor_mutex_acquire(mutex);
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switch (r) {
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case WAIT_OBJECT_0: /* we got the mutex normally. */
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break;
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case WAIT_ABANDONED: /* holding thread exited. */
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case WAIT_TIMEOUT: /* Should never happen. */
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tor_assert(0);
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break;
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case WAIT_FAILED:
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log_warn(LD_GENERAL, "Failed to acquire mutex: %d",(int) GetLastError());
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}
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return 0;
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}
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void
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tor_cond_signal_one(tor_cond_t *cond)
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{
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HANDLE event;
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tor_assert(cond);
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EnterCriticalSection(&cond->mutex);
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if ((event = smartlist_pop_last(cond->events)))
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SetEvent(event);
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LeaveCriticalSection(&cond->mutex);
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}
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void
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tor_cond_signal_all(tor_cond_t *cond)
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{
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tor_assert(cond);
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EnterCriticalSection(&cond->mutex);
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SMARTLIST_FOREACH(cond->events, HANDLE, event, SetEvent(event));
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smartlist_clear(cond->events);
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LeaveCriticalSection(&cond->mutex);
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}
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#endif
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void
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tor_threads_init(void)
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{
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#if 0
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cond_event_tls_index = TlsAlloc();
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#endif
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set_main_thread();
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}
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#endif
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#if defined(HAVE_MLOCKALL) && HAVE_DECL_MLOCKALL && defined(RLIMIT_MEMLOCK)
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/** Attempt to raise the current and max rlimit to infinity for our process.
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* This only needs to be done once and can probably only be done when we have
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@ -3292,23 +2915,6 @@ tor_mlockall(void)
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#endif
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}
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/** Identity of the "main" thread */
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static unsigned long main_thread_id = -1;
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/** Start considering the current thread to be the 'main thread'. This has
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* no effect on anything besides in_main_thread(). */
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void
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set_main_thread(void)
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{
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main_thread_id = tor_get_thread_id();
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}
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/** Return true iff called from the main thread. */
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int
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in_main_thread(void)
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{
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return main_thread_id == tor_get_thread_id();
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}
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/**
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* On Windows, WSAEWOULDBLOCK is not always correct: when you see it,
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* you need to ask the socket for its actual errno. Also, you need to
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@ -36,9 +36,6 @@
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#if defined(HAVE_PTHREAD_H) && !defined(_WIN32)
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#include <pthread.h>
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#endif
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#include <stdarg.h>
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#ifdef HAVE_SYS_RESOURCE_H
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#include <sys/resource.h>
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@ -642,61 +639,10 @@ char **get_environment(void);
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int get_total_system_memory(size_t *mem_out);
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int spawn_func(void (*func)(void *), void *data);
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void spawn_exit(void) ATTR_NORETURN;
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#if defined(_WIN32)
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#define USE_WIN32_THREADS
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#elif defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_CREATE)
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#define USE_PTHREADS
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#else
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#error "No threading system was found"
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#endif
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int compute_num_cpus(void);
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/* Because we use threads instead of processes on most platforms (Windows,
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* Linux, etc), we need locking for them. On platforms with poor thread
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* support or broken gethostbyname_r, these functions are no-ops. */
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/** A generic lock structure for multithreaded builds. */
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typedef struct tor_mutex_t {
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#if defined(USE_WIN32_THREADS)
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/** Windows-only: on windows, we implement locks with CRITICAL_SECTIONS. */
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CRITICAL_SECTION mutex;
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#elif defined(USE_PTHREADS)
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/** Pthreads-only: with pthreads, we implement locks with
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* pthread_mutex_t. */
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pthread_mutex_t mutex;
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#else
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/** No-threads only: Dummy variable so that tor_mutex_t takes up space. */
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int _unused;
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#endif
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} tor_mutex_t;
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int tor_mlockall(void);
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tor_mutex_t *tor_mutex_new(void);
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void tor_mutex_init(tor_mutex_t *m);
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void tor_mutex_acquire(tor_mutex_t *m);
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void tor_mutex_release(tor_mutex_t *m);
|
||||
void tor_mutex_free(tor_mutex_t *m);
|
||||
void tor_mutex_uninit(tor_mutex_t *m);
|
||||
unsigned long tor_get_thread_id(void);
|
||||
void tor_threads_init(void);
|
||||
|
||||
void set_main_thread(void);
|
||||
int in_main_thread(void);
|
||||
|
||||
#if 0
|
||||
typedef struct tor_cond_t tor_cond_t;
|
||||
tor_cond_t *tor_cond_new(void);
|
||||
void tor_cond_free(tor_cond_t *cond);
|
||||
int tor_cond_wait(tor_cond_t *cond, tor_mutex_t *mutex);
|
||||
void tor_cond_signal_one(tor_cond_t *cond);
|
||||
void tor_cond_signal_all(tor_cond_t *cond);
|
||||
#endif
|
||||
|
||||
/** Macros for MIN/MAX. Never use these when the arguments could have
|
||||
* side-effects.
|
||||
* {With GCC extensions we could probably define a safer MIN/MAX. But
|
||||
@ -742,5 +688,8 @@ STATIC int tor_ersatz_socketpair(int family, int type, int protocol,
|
||||
#endif
|
||||
#endif
|
||||
|
||||
/* This needs some of the declarations above so we include it here. */
|
||||
#include "compat_threads.h"
|
||||
|
||||
#endif
|
||||
|
||||
|
||||
211
src/common/compat_pthreads.c
Normal file
211
src/common/compat_pthreads.c
Normal file
@ -0,0 +1,211 @@
|
||||
/* Copyright (c) 2003-2004, Roger Dingledine
|
||||
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
|
||||
* Copyright (c) 2007-2015, The Tor Project, Inc. */
|
||||
/* See LICENSE for licensing information */
|
||||
|
||||
#include "orconfig.h"
|
||||
#include <pthread.h>
|
||||
|
||||
#include "compat.h"
|
||||
#include "torlog.h"
|
||||
#include "util.h"
|
||||
|
||||
/** Wraps a void (*)(void*) function and its argument so we can
|
||||
* invoke them in a way pthreads would expect.
|
||||
*/
|
||||
typedef struct tor_pthread_data_t {
|
||||
void (*func)(void *);
|
||||
void *data;
|
||||
} tor_pthread_data_t;
|
||||
/** Given a tor_pthread_data_t <b>_data</b>, call _data->func(d->data)
|
||||
* and free _data. Used to make sure we can call functions the way pthread
|
||||
* expects. */
|
||||
static void *
|
||||
tor_pthread_helper_fn(void *_data)
|
||||
{
|
||||
tor_pthread_data_t *data = _data;
|
||||
void (*func)(void*);
|
||||
void *arg;
|
||||
/* mask signals to worker threads to avoid SIGPIPE, etc */
|
||||
sigset_t sigs;
|
||||
/* We're in a subthread; don't handle any signals here. */
|
||||
sigfillset(&sigs);
|
||||
pthread_sigmask(SIG_SETMASK, &sigs, NULL);
|
||||
|
||||
func = data->func;
|
||||
arg = data->data;
|
||||
tor_free(_data);
|
||||
func(arg);
|
||||
return NULL;
|
||||
}
|
||||
/**
|
||||
* A pthread attribute to make threads start detached.
|
||||
*/
|
||||
static pthread_attr_t attr_detached;
|
||||
/** True iff we've called tor_threads_init() */
|
||||
static int threads_initialized = 0;
|
||||
|
||||
|
||||
/** Minimalist interface to run a void function in the background. On
|
||||
* Unix calls fork, on win32 calls beginthread. Returns -1 on failure.
|
||||
* func should not return, but rather should call spawn_exit.
|
||||
*
|
||||
* NOTE: if <b>data</b> is used, it should not be allocated on the stack,
|
||||
* since in a multithreaded environment, there is no way to be sure that
|
||||
* the caller's stack will still be around when the called function is
|
||||
* running.
|
||||
*/
|
||||
int
|
||||
spawn_func(void (*func)(void *), void *data)
|
||||
{
|
||||
pthread_t thread;
|
||||
tor_pthread_data_t *d;
|
||||
if (PREDICT_UNLIKELY(!threads_initialized))
|
||||
tor_threads_init();
|
||||
d = tor_malloc(sizeof(tor_pthread_data_t));
|
||||
d->data = data;
|
||||
d->func = func;
|
||||
if (pthread_create(&thread,&attr_detached,tor_pthread_helper_fn,d))
|
||||
return -1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/** End the current thread/process.
|
||||
*/
|
||||
void
|
||||
spawn_exit(void)
|
||||
{
|
||||
pthread_exit(NULL);
|
||||
}
|
||||
|
||||
/** A mutex attribute that we're going to use to tell pthreads that we want
|
||||
* "reentrant" mutexes (i.e., once we can re-lock if we're already holding
|
||||
* them.) */
|
||||
static pthread_mutexattr_t attr_reentrant;
|
||||
/** Initialize <b>mutex</b> so it can be locked. Every mutex must be set
|
||||
* up with tor_mutex_init() or tor_mutex_new(); not both. */
|
||||
void
|
||||
tor_mutex_init(tor_mutex_t *mutex)
|
||||
{
|
||||
int err;
|
||||
if (PREDICT_UNLIKELY(!threads_initialized))
|
||||
tor_threads_init();
|
||||
err = pthread_mutex_init(&mutex->mutex, &attr_reentrant);
|
||||
if (PREDICT_UNLIKELY(err)) {
|
||||
log_err(LD_GENERAL, "Error %d creating a mutex.", err);
|
||||
tor_fragile_assert();
|
||||
}
|
||||
}
|
||||
/** Wait until <b>m</b> is free, then acquire it. */
|
||||
void
|
||||
tor_mutex_acquire(tor_mutex_t *m)
|
||||
{
|
||||
int err;
|
||||
tor_assert(m);
|
||||
err = pthread_mutex_lock(&m->mutex);
|
||||
if (PREDICT_UNLIKELY(err)) {
|
||||
log_err(LD_GENERAL, "Error %d locking a mutex.", err);
|
||||
tor_fragile_assert();
|
||||
}
|
||||
}
|
||||
/** Release the lock <b>m</b> so another thread can have it. */
|
||||
void
|
||||
tor_mutex_release(tor_mutex_t *m)
|
||||
{
|
||||
int err;
|
||||
tor_assert(m);
|
||||
err = pthread_mutex_unlock(&m->mutex);
|
||||
if (PREDICT_UNLIKELY(err)) {
|
||||
log_err(LD_GENERAL, "Error %d unlocking a mutex.", err);
|
||||
tor_fragile_assert();
|
||||
}
|
||||
}
|
||||
/** Clean up the mutex <b>m</b> so that it no longer uses any system
|
||||
* resources. Does not free <b>m</b>. This function must only be called on
|
||||
* mutexes from tor_mutex_init(). */
|
||||
void
|
||||
tor_mutex_uninit(tor_mutex_t *m)
|
||||
{
|
||||
int err;
|
||||
tor_assert(m);
|
||||
err = pthread_mutex_destroy(&m->mutex);
|
||||
if (PREDICT_UNLIKELY(err)) {
|
||||
log_err(LD_GENERAL, "Error %d destroying a mutex.", err);
|
||||
tor_fragile_assert();
|
||||
}
|
||||
}
|
||||
/** Return an integer representing this thread. */
|
||||
unsigned long
|
||||
tor_get_thread_id(void)
|
||||
{
|
||||
union {
|
||||
pthread_t thr;
|
||||
unsigned long id;
|
||||
} r;
|
||||
r.thr = pthread_self();
|
||||
return r.id;
|
||||
}
|
||||
|
||||
/* Conditions. */
|
||||
|
||||
/** Cross-platform condition implementation. */
|
||||
struct tor_cond_t {
|
||||
pthread_cond_t cond;
|
||||
};
|
||||
/** Return a newly allocated condition, with nobody waiting on it. */
|
||||
tor_cond_t *
|
||||
tor_cond_new(void)
|
||||
{
|
||||
tor_cond_t *cond = tor_malloc_zero(sizeof(tor_cond_t));
|
||||
if (pthread_cond_init(&cond->cond, NULL)) {
|
||||
tor_free(cond);
|
||||
return NULL;
|
||||
}
|
||||
return cond;
|
||||
}
|
||||
/** Release all resources held by <b>cond</b>. */
|
||||
void
|
||||
tor_cond_free(tor_cond_t *cond)
|
||||
{
|
||||
if (!cond)
|
||||
return;
|
||||
if (pthread_cond_destroy(&cond->cond)) {
|
||||
log_warn(LD_GENERAL,"Error freeing condition: %s", strerror(errno));
|
||||
return;
|
||||
}
|
||||
tor_free(cond);
|
||||
}
|
||||
/** Wait until one of the tor_cond_signal functions is called on <b>cond</b>.
|
||||
* All waiters on the condition must wait holding the same <b>mutex</b>.
|
||||
* Returns 0 on success, negative on failure. */
|
||||
int
|
||||
tor_cond_wait(tor_cond_t *cond, tor_mutex_t *mutex)
|
||||
{
|
||||
return pthread_cond_wait(&cond->cond, &mutex->mutex) ? -1 : 0;
|
||||
}
|
||||
/** Wake up one of the waiters on <b>cond</b>. */
|
||||
void
|
||||
tor_cond_signal_one(tor_cond_t *cond)
|
||||
{
|
||||
pthread_cond_signal(&cond->cond);
|
||||
}
|
||||
/** Wake up all of the waiters on <b>cond</b>. */
|
||||
void
|
||||
tor_cond_signal_all(tor_cond_t *cond)
|
||||
{
|
||||
pthread_cond_broadcast(&cond->cond);
|
||||
}
|
||||
|
||||
/** Set up common structures for use by threading. */
|
||||
void
|
||||
tor_threads_init(void)
|
||||
{
|
||||
if (!threads_initialized) {
|
||||
pthread_mutexattr_init(&attr_reentrant);
|
||||
pthread_mutexattr_settype(&attr_reentrant, PTHREAD_MUTEX_RECURSIVE);
|
||||
tor_assert(0==pthread_attr_init(&attr_detached));
|
||||
tor_assert(0==pthread_attr_setdetachstate(&attr_detached, 1));
|
||||
threads_initialized = 1;
|
||||
set_main_thread();
|
||||
}
|
||||
}
|
||||
42
src/common/compat_threads.c
Normal file
42
src/common/compat_threads.c
Normal file
@ -0,0 +1,42 @@
|
||||
/* Copyright (c) 2003-2004, Roger Dingledine
|
||||
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
|
||||
* Copyright (c) 2007-2015, The Tor Project, Inc. */
|
||||
/* See LICENSE for licensing information */
|
||||
|
||||
#include "compat.h"
|
||||
#include "util.h"
|
||||
|
||||
/** Return a newly allocated, ready-for-use mutex. */
|
||||
tor_mutex_t *
|
||||
tor_mutex_new(void)
|
||||
{
|
||||
tor_mutex_t *m = tor_malloc_zero(sizeof(tor_mutex_t));
|
||||
tor_mutex_init(m);
|
||||
return m;
|
||||
}
|
||||
/** Release all storage and system resources held by <b>m</b>. */
|
||||
void
|
||||
tor_mutex_free(tor_mutex_t *m)
|
||||
{
|
||||
if (!m)
|
||||
return;
|
||||
tor_mutex_uninit(m);
|
||||
tor_free(m);
|
||||
}
|
||||
|
||||
/** Identity of the "main" thread */
|
||||
static unsigned long main_thread_id = -1;
|
||||
|
||||
/** Start considering the current thread to be the 'main thread'. This has
|
||||
* no effect on anything besides in_main_thread(). */
|
||||
void
|
||||
set_main_thread(void)
|
||||
{
|
||||
main_thread_id = tor_get_thread_id();
|
||||
}
|
||||
/** Return true iff called from the main thread. */
|
||||
int
|
||||
in_main_thread(void)
|
||||
{
|
||||
return main_thread_id == tor_get_thread_id();
|
||||
}
|
||||
67
src/common/compat_threads.h
Normal file
67
src/common/compat_threads.h
Normal file
@ -0,0 +1,67 @@
|
||||
/* Copyright (c) 2003-2004, Roger Dingledine
|
||||
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
|
||||
* Copyright (c) 2007-2015, The Tor Project, Inc. */
|
||||
/* See LICENSE for licensing information */
|
||||
|
||||
#ifndef TOR_COMPAT_THREADS_H
|
||||
#define TOR_COMPAT_THREADS_H
|
||||
|
||||
#include "orconfig.h"
|
||||
#include "torint.h"
|
||||
#include "testsupport.h"
|
||||
|
||||
#if defined(HAVE_PTHREAD_H) && !defined(_WIN32)
|
||||
#include <pthread.h>
|
||||
#endif
|
||||
|
||||
#if defined(_WIN32)
|
||||
#define USE_WIN32_THREADS
|
||||
#elif defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_CREATE)
|
||||
#define USE_PTHREADS
|
||||
#else
|
||||
#error "No threading system was found"
|
||||
#endif
|
||||
|
||||
int spawn_func(void (*func)(void *), void *data);
|
||||
void spawn_exit(void) ATTR_NORETURN;
|
||||
|
||||
/* Because we use threads instead of processes on most platforms (Windows,
|
||||
* Linux, etc), we need locking for them. On platforms with poor thread
|
||||
* support or broken gethostbyname_r, these functions are no-ops. */
|
||||
|
||||
/** A generic lock structure for multithreaded builds. */
|
||||
typedef struct tor_mutex_t {
|
||||
#if defined(USE_WIN32_THREADS)
|
||||
/** Windows-only: on windows, we implement locks with CRITICAL_SECTIONS. */
|
||||
CRITICAL_SECTION mutex;
|
||||
#elif defined(USE_PTHREADS)
|
||||
/** Pthreads-only: with pthreads, we implement locks with
|
||||
* pthread_mutex_t. */
|
||||
pthread_mutex_t mutex;
|
||||
#else
|
||||
/** No-threads only: Dummy variable so that tor_mutex_t takes up space. */
|
||||
int _unused;
|
||||
#endif
|
||||
} tor_mutex_t;
|
||||
|
||||
|
||||
tor_mutex_t *tor_mutex_new(void);
|
||||
void tor_mutex_init(tor_mutex_t *m);
|
||||
void tor_mutex_acquire(tor_mutex_t *m);
|
||||
void tor_mutex_release(tor_mutex_t *m);
|
||||
void tor_mutex_free(tor_mutex_t *m);
|
||||
void tor_mutex_uninit(tor_mutex_t *m);
|
||||
unsigned long tor_get_thread_id(void);
|
||||
void tor_threads_init(void);
|
||||
|
||||
void set_main_thread(void);
|
||||
int in_main_thread(void);
|
||||
|
||||
typedef struct tor_cond_t tor_cond_t;
|
||||
tor_cond_t *tor_cond_new(void);
|
||||
void tor_cond_free(tor_cond_t *cond);
|
||||
int tor_cond_wait(tor_cond_t *cond, tor_mutex_t *mutex);
|
||||
void tor_cond_signal_one(tor_cond_t *cond);
|
||||
void tor_cond_signal_all(tor_cond_t *cond);
|
||||
|
||||
#endif
|
||||
161
src/common/compat_winthreads.c
Normal file
161
src/common/compat_winthreads.c
Normal file
@ -0,0 +1,161 @@
|
||||
/* Copyright (c) 2003-2004, Roger Dingledine
|
||||
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
|
||||
* Copyright (c) 2007-2015, The Tor Project, Inc. */
|
||||
/* See LICENSE for licensing information */
|
||||
|
||||
#include "compat.h"
|
||||
#include <windows.h>
|
||||
#include <process.h>
|
||||
#include "util.h"
|
||||
#include "container.h"
|
||||
#include "torlog.h"
|
||||
|
||||
/** Minimalist interface to run a void function in the background. On
|
||||
* Unix calls fork, on win32 calls beginthread. Returns -1 on failure.
|
||||
* func should not return, but rather should call spawn_exit.
|
||||
*
|
||||
* NOTE: if <b>data</b> is used, it should not be allocated on the stack,
|
||||
* since in a multithreaded environment, there is no way to be sure that
|
||||
* the caller's stack will still be around when the called function is
|
||||
* running.
|
||||
*/
|
||||
int
|
||||
spawn_func(void (*func)(void *), void *data)
|
||||
{
|
||||
int rv;
|
||||
rv = (int)_beginthread(func, 0, data);
|
||||
if (rv == (int)-1)
|
||||
return -1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/** End the current thread/process.
|
||||
*/
|
||||
void
|
||||
spawn_exit(void)
|
||||
{
|
||||
_endthread();
|
||||
//we should never get here. my compiler thinks that _endthread returns, this
|
||||
//is an attempt to fool it.
|
||||
tor_assert(0);
|
||||
_exit(0);
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
tor_mutex_init(tor_mutex_t *m)
|
||||
{
|
||||
InitializeCriticalSection(&m->mutex);
|
||||
}
|
||||
void
|
||||
tor_mutex_uninit(tor_mutex_t *m)
|
||||
{
|
||||
DeleteCriticalSection(&m->mutex);
|
||||
}
|
||||
void
|
||||
tor_mutex_acquire(tor_mutex_t *m)
|
||||
{
|
||||
tor_assert(m);
|
||||
EnterCriticalSection(&m->mutex);
|
||||
}
|
||||
void
|
||||
tor_mutex_release(tor_mutex_t *m)
|
||||
{
|
||||
LeaveCriticalSection(&m->mutex);
|
||||
}
|
||||
unsigned long
|
||||
tor_get_thread_id(void)
|
||||
{
|
||||
return (unsigned long)GetCurrentThreadId();
|
||||
}
|
||||
|
||||
static DWORD cond_event_tls_index;
|
||||
struct tor_cond_t {
|
||||
CRITICAL_SECTION mutex;
|
||||
smartlist_t *events;
|
||||
};
|
||||
tor_cond_t *
|
||||
tor_cond_new(void)
|
||||
{
|
||||
tor_cond_t *cond = tor_malloc_zero(sizeof(tor_cond_t));
|
||||
InitializeCriticalSection(&cond->mutex);
|
||||
cond->events = smartlist_new();
|
||||
return cond;
|
||||
}
|
||||
void
|
||||
tor_cond_free(tor_cond_t *cond)
|
||||
{
|
||||
if (!cond)
|
||||
return;
|
||||
DeleteCriticalSection(&cond->mutex);
|
||||
/* XXXX notify? */
|
||||
smartlist_free(cond->events);
|
||||
tor_free(cond);
|
||||
}
|
||||
int
|
||||
tor_cond_wait(tor_cond_t *cond, tor_mutex_t *mutex)
|
||||
{
|
||||
HANDLE event;
|
||||
int r;
|
||||
tor_assert(cond);
|
||||
tor_assert(mutex);
|
||||
event = TlsGetValue(cond_event_tls_index);
|
||||
if (!event) {
|
||||
event = CreateEvent(0, FALSE, FALSE, NULL);
|
||||
TlsSetValue(cond_event_tls_index, event);
|
||||
}
|
||||
EnterCriticalSection(&cond->mutex);
|
||||
|
||||
tor_assert(WaitForSingleObject(event, 0) == WAIT_TIMEOUT);
|
||||
tor_assert(!smartlist_contains(cond->events, event));
|
||||
smartlist_add(cond->events, event);
|
||||
|
||||
LeaveCriticalSection(&cond->mutex);
|
||||
|
||||
tor_mutex_release(mutex);
|
||||
r = WaitForSingleObject(event, INFINITE);
|
||||
tor_mutex_acquire(mutex);
|
||||
|
||||
switch (r) {
|
||||
case WAIT_OBJECT_0: /* we got the mutex normally. */
|
||||
break;
|
||||
case WAIT_ABANDONED: /* holding thread exited. */
|
||||
case WAIT_TIMEOUT: /* Should never happen. */
|
||||
tor_assert(0);
|
||||
break;
|
||||
case WAIT_FAILED:
|
||||
log_warn(LD_GENERAL, "Failed to acquire mutex: %d",(int) GetLastError());
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
void
|
||||
tor_cond_signal_one(tor_cond_t *cond)
|
||||
{
|
||||
HANDLE event;
|
||||
tor_assert(cond);
|
||||
|
||||
EnterCriticalSection(&cond->mutex);
|
||||
|
||||
if ((event = smartlist_pop_last(cond->events)))
|
||||
SetEvent(event);
|
||||
|
||||
LeaveCriticalSection(&cond->mutex);
|
||||
}
|
||||
void
|
||||
tor_cond_signal_all(tor_cond_t *cond)
|
||||
{
|
||||
tor_assert(cond);
|
||||
|
||||
EnterCriticalSection(&cond->mutex);
|
||||
SMARTLIST_FOREACH(cond->events, HANDLE, event, SetEvent(event));
|
||||
smartlist_clear(cond->events);
|
||||
LeaveCriticalSection(&cond->mutex);
|
||||
}
|
||||
|
||||
void
|
||||
tor_threads_init(void)
|
||||
{
|
||||
cond_event_tls_index = TlsAlloc();
|
||||
set_main_thread();
|
||||
}
|
||||
@ -54,10 +54,18 @@ endif
|
||||
|
||||
LIBDONNA += $(LIBED25519_REF10)
|
||||
|
||||
if THREADS_PTHREADS
|
||||
threads_impl_source=src/common/compat_pthreads.c
|
||||
endif
|
||||
if THREADS_WIN32
|
||||
threads_impl_source=src/common/compat_winthreads.c
|
||||
endif
|
||||
|
||||
LIBOR_A_SOURCES = \
|
||||
src/common/address.c \
|
||||
src/common/backtrace.c \
|
||||
src/common/compat.c \
|
||||
src/common/compat_threads.c \
|
||||
src/common/container.c \
|
||||
src/common/di_ops.c \
|
||||
src/common/log.c \
|
||||
@ -69,7 +77,8 @@ LIBOR_A_SOURCES = \
|
||||
src/ext/csiphash.c \
|
||||
src/ext/trunnel/trunnel.c \
|
||||
$(libor_extra_source) \
|
||||
$(libor_mempool_source)
|
||||
$(libor_mempool_source) \
|
||||
$(threads_impl_source)
|
||||
|
||||
LIBOR_CRYPTO_A_SOURCES = \
|
||||
src/common/aes.c \
|
||||
@ -102,7 +111,6 @@ src_common_libor_testing_a_CFLAGS = $(AM_CFLAGS) $(TEST_CFLAGS)
|
||||
src_common_libor_crypto_testing_a_CFLAGS = $(AM_CFLAGS) $(TEST_CFLAGS)
|
||||
src_common_libor_event_testing_a_CFLAGS = $(AM_CFLAGS) $(TEST_CFLAGS)
|
||||
|
||||
|
||||
COMMONHEADERS = \
|
||||
src/common/address.h \
|
||||
src/common/backtrace.h \
|
||||
@ -110,6 +118,7 @@ COMMONHEADERS = \
|
||||
src/common/ciphers.inc \
|
||||
src/common/compat.h \
|
||||
src/common/compat_libevent.h \
|
||||
src/common/compat_threads.h \
|
||||
src/common/container.h \
|
||||
src/common/crypto.h \
|
||||
src/common/crypto_curve25519.h \
|
||||
|
||||
Loading…
Reference in New Issue
Block a user