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Problem: pthread condvar timeouts are broken (#2967)

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* fix pthread condvar timeouts

This fixes a race condition / hang for threadsafe sockets.
Context: https://github.com/zeromq/czmq/issues/1873#issuecomment-370279244
This commit is contained in:
Ryan Hileman 2018-03-05 08:36:10 -08:00 committed by Luca Boccassi
parent d54633add1
commit 3658b2b580
1 changed files with 24 additions and 5 deletions
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29
src/condition_variable.hpp
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@ -174,6 +174,13 @@ class condition_variable_t
#include <pthread.h>
#if defined(__ANDROID_API__) && __ANDROID_API__ < 21
#define ANDROID_LEGACY
extern "C" int pthread_cond_timedwait_monotonic_np (pthread_cond_t *,
pthread_mutex_t *,
const struct timespec *);
#endif
namespace zmq
{
class condition_variable_t
@ -181,7 +188,12 @@ class condition_variable_t
public:
inline condition_variable_t ()
{
int rc = pthread_cond_init (&cond, NULL);
pthread_condattr_t attr;
pthread_condattr_init (&attr);
#if !defined(ZMQ_HAVE_OSX) && !defined(ANDROID_LEGACY)
pthread_condattr_setclock (&attr, CLOCK_MONOTONIC);
#endif
int rc = pthread_cond_init (&cond, &attr);
posix_assert (rc);
}
@ -198,9 +210,9 @@ class condition_variable_t
if (timeout_ != -1) {
struct timespec timeout;
#if defined ZMQ_HAVE_OSX \
&& __MAC_OS_X_VERSION_MIN_REQUIRED < 101200 // less than macOS 10.12
alt_clock_gettime (SYSTEM_CLOCK, &timeout);
#ifdef ZMQ_HAVE_OSX
timeout.tv_sec = 0;
timeout.tv_nsec = 0;
#else
clock_gettime (CLOCK_MONOTONIC, &timeout);
#endif
@ -212,8 +224,15 @@ class condition_variable_t
timeout.tv_sec++;
timeout.tv_nsec -= 1000000000;
}
#ifdef ZMQ_HAVE_OSX
rc = pthread_cond_timedwait_relative_np (
&cond, mutex_->get_mutex (), &timeout);
#elif defined(ANDROID_LEGACY)
rc = pthread_cond_timedwait_monotonic_np (
&cond, mutex_->get_mutex (), &timeout);
#else
rc = pthread_cond_timedwait (&cond, mutex_->get_mutex (), &timeout);
#endif
} else
rc = pthread_cond_wait (&cond, mutex_->get_mutex ());