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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 "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()
{
#if defined HAVE_MLOCK
@ -59,8 +65,8 @@ static void do_lock(void *ptr, size_t len)
{
#if defined HAVE_MLOCK
int ret = mlock(ptr, len);
if (ret < 0)
MERROR("Error locking page at " << ptr << ": " << strerror(errno));
if (ret < 0 && !previously_failed.exchange(true))
MERROR("Error locking page at " << ptr << ": " << strerror(errno) << ", subsequent mlock errors will be silenced");
#else
#warning Missing do_lock implementation
#endif
@ -70,7 +76,10 @@ static void do_unlock(void *ptr, size_t len)
{
#if defined HAVE_MLOCK
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));
#else
#warning Missing implementation of page size detection