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Only show a single mlock() error, to avoid flooding the log

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This commit is contained in:
Martijn Otto 2018-11-20 17:11:06 +01:00
parent 84dd674cd0
commit 1132436f97
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GPG Key ID: D2E0D5D0B1D606F9
1 changed files with 12 additions and 3 deletions
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15
contrib/epee/src/mlocker.cpp
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@ -38,6 +38,12 @@
#include "syncobj.h" #include "syncobj.h"
#include "mlocker.h" #include "mlocker.h"
#include <atomic>
// did an mlock operation previously fail? we only
// want to log an error once and be done with it
static std::atomic<bool> previously_failed{ false };
static size_t query_page_size() static size_t query_page_size()
{ {
#if defined HAVE_MLOCK #if defined HAVE_MLOCK
@ -59,8 +65,8 @@ static void do_lock(void *ptr, size_t len)
{ {
#if defined HAVE_MLOCK #if defined HAVE_MLOCK
int ret = mlock(ptr, len); int ret = mlock(ptr, len);
if (ret < 0) if (ret < 0 && !previously_failed.exchange(true))
MERROR("Error locking page at " << ptr << ": " << strerror(errno)); MERROR("Error locking page at " << ptr << ": " << strerror(errno) << ", subsequent mlock errors will be silenced");
#else #else
#warning Missing do_lock implementation #warning Missing do_lock implementation
#endif #endif
@ -70,7 +76,10 @@ static void do_unlock(void *ptr, size_t len)
{ {
#if defined HAVE_MLOCK #if defined HAVE_MLOCK
int ret = munlock(ptr, len); int ret = munlock(ptr, len);
if (ret < 0) // check whether we previously failed, but don't set it, this is just
// to pacify the errors of mlock()ing failed, in which case unlocking
// is also not going to work of course
if (ret < 0 && !previously_failed.load())
MERROR("Error unlocking page at " << ptr << ": " << strerror(errno)); MERROR("Error unlocking page at " << ptr << ": " << strerror(errno));
#else #else
#warning Missing implementation of page size detection #warning Missing implementation of page size detection