1                 : /*
       2                 :  * Copyright (c) 2011 The Native Client Authors. All rights reserved.
       3                 :  * Use of this source code is governed by a BSD-style license that can be
       4                 :  * found in the LICENSE file.
       5                 :  */
       6                 : 
       7                 : #include <pthread.h>
       8                 : #include <sys/time.h>
       9                 : #include "native_client/src/shared/platform/nacl_sync.h"
      10                 : #include "native_client/src/include/nacl_base.h"
      11                 : #include "native_client/src/include/nacl_macros.h"
      12                 : #include "native_client/src/trusted/service_runtime/include/sys/time.h"
      13                 : 
      14                 : static const uint64_t kMicrosecondsPerSecond = 1000 * 1000;
      15                 : static const uint64_t kNanosecondsPerMicrosecond = 1000;
      16                 : 
      17                 : /* Condition variable C API */
      18                 : 
      19           21719 : int NaClCondVarCtor(struct NaClCondVar  *cvp) {
      20           21719 :   if (0 != pthread_cond_init(&cvp->cv, (pthread_condattr_t *) 0)) {
      21               0 :     return 0;
      22                 :   }
      23           21719 :   return 1;
      24           21719 : }
      25                 : 
      26           20603 : void NaClCondVarDtor(struct NaClCondVar *cvp) {
      27           20603 :   pthread_cond_destroy(&cvp->cv);
      28           20603 : }
      29                 : 
      30           43142 : NaClSyncStatus NaClCondVarSignal(struct NaClCondVar *cvp) {
      31           43142 :   pthread_cond_signal(&cvp->cv);
      32           43142 :   return NACL_SYNC_OK;
      33                 : }
      34                 : 
      35            1086 : NaClSyncStatus NaClCondVarBroadcast(struct NaClCondVar *cvp) {
      36            1086 :   pthread_cond_broadcast(&cvp->cv);
      37            1086 :   return NACL_SYNC_OK;
      38                 : }
      39                 : 
      40           42418 : NaClSyncStatus NaClCondVarWait(struct NaClCondVar *cvp,
      41           42418 :                                struct NaClMutex   *mp) {
      42           42418 :   pthread_cond_wait(&cvp->cv, &mp->mu);
      43           42418 :   return NACL_SYNC_OK;
      44                 : }
      45                 : 
      46                 : NaClSyncStatus NaClCondVarTimedWaitRelative(
      47               0 :     struct NaClCondVar             *cvp,
      48               0 :     struct NaClMutex               *mp,
      49               0 :     NACL_TIMESPEC_T const          *reltime) {
      50               0 :   uint64_t relative_wait_us =
      51                 :       reltime->tv_sec * kMicrosecondsPerSecond +
      52                 :       reltime->tv_nsec / kNanosecondsPerMicrosecond;
      53               0 :   uint64_t current_time_us;
      54               0 :   uint64_t wakeup_time_us;
      55               0 :   int result;
      56               0 :   struct timespec ts;
      57               0 :   struct timeval tv;
      58               0 :   struct timezone tz = { 0, 0 };  /* UTC */
      59               0 :   if (gettimeofday(&tv, &tz) == 0) {
      60               0 :     current_time_us = tv.tv_sec * kMicrosecondsPerSecond + tv.tv_usec;
      61               0 :   } else {
      62               0 :     return NACL_SYNC_INTERNAL_ERROR;
      63                 :   }
      64               0 :   wakeup_time_us = current_time_us + relative_wait_us;
      65               0 :   ts.tv_sec = wakeup_time_us / kMicrosecondsPerSecond;
      66               0 :   ts.tv_nsec = (wakeup_time_us - ts.tv_sec * kMicrosecondsPerSecond) *
      67                 :                kNanosecondsPerMicrosecond;
      68                 : 
      69               0 :   result = pthread_cond_timedwait(&cvp->cv, &mp->mu, &ts);
      70               0 :   if (0 == result) {
      71               0 :     return NACL_SYNC_OK;
      72                 :   }
      73               0 :   return NACL_SYNC_CONDVAR_TIMEDOUT;
      74               0 : }
      75                 : 
      76                 : NaClSyncStatus NaClCondVarTimedWaitAbsolute(
      77               8 :     struct NaClCondVar              *cvp,
      78               8 :     struct NaClMutex                *mp,
      79               8 :     NACL_TIMESPEC_T const           *abstime) {
      80               8 :   struct timespec ts;
      81               8 :   int result;
      82               8 :   ts.tv_sec = abstime->tv_sec;
      83               8 :   ts.tv_nsec = abstime->tv_nsec;
      84               8 :   result = pthread_cond_timedwait(&cvp->cv, &mp->mu, &ts);
      85               8 :   if (0 == result) {
      86               0 :     return NACL_SYNC_OK;
      87                 :   }
      88               8 :   return NACL_SYNC_CONDVAR_TIMEDOUT;
      89               8 : }