source: azure_iot_hub/trunk/musl-1.1.18/src/thread/pthread_mutex_timedlock.c@ 388

Last change on this file since 388 was 388, checked in by coas-nagasima, 5 years ago

Azure IoT Hub Device C SDK を使ったサンプルの追加
  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
  • Property svn:mime-type set to text/x-csrc
File size: 915 bytes
Line 
1#include "pthread_impl.h"
2
3int __pthread_mutex_timedlock(pthread_mutex_t *restrict m, const struct timespec *restrict at)
4{
5 if ((m->_m_type&15) == PTHREAD_MUTEX_NORMAL
6 && !a_cas(&m->_m_lock, 0, EBUSY))
7 return 0;
8
9 int r, t, priv = (m->_m_type & 128) ^ 128;
10
11 r = pthread_mutex_trylock(m);
12 if (r != EBUSY) return r;
13
14 int spins = 100;
15 while (spins-- && m->_m_lock && !m->_m_waiters) a_spin();
16
17 while ((r=pthread_mutex_trylock(m)) == EBUSY) {
18 if (!(r=m->_m_lock) || ((r&0x40000000) && (m->_m_type&4)))
19 continue;
20 if ((m->_m_type&3) == PTHREAD_MUTEX_ERRORCHECK
21 && (r&0x7fffffff) == __pthread_self()->tid)
22 return EDEADLK;
23
24 a_inc(&m->_m_waiters);
25 t = r | 0x80000000;
26 a_cas(&m->_m_lock, r, t);
27 r = __timedwait(&m->_m_lock, t, CLOCK_REALTIME, at, priv);
28 a_dec(&m->_m_waiters);
29 if (r && r != EINTR) break;
30 }
31 return r;
32}
33
34weak_alias(__pthread_mutex_timedlock, pthread_mutex_timedlock);
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