Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* vim: set ts=8 sts=2 et sw=2 tw=80: */
       3             : /* This Source Code Form is subject to the terms of the Mozilla Public
       4             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       5             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : 
       7             : #include "mozilla/Assertions.h"
       8             : 
       9             : #include <errno.h>
      10             : #include <pthread.h>
      11             : #include <stdio.h>
      12             : 
      13             : #include "mozilla/PlatformMutex.h"
      14             : #include "MutexPlatformData_posix.h"
      15             : 
      16             : #define TRY_CALL_PTHREADS(call, msg)            \
      17             :   {                                             \
      18             :     int result = (call);                        \
      19             :     if (result != 0) {                          \
      20             :       errno = result;                           \
      21             :       perror(msg);                              \
      22             :       MOZ_CRASH(msg);                           \
      23             :     }                                           \
      24             :   }
      25             : 
      26        1411 : mozilla::detail::MutexImpl::MutexImpl()
      27             : {
      28        1411 :   pthread_mutexattr_t* attrp = nullptr;
      29             : 
      30             :   // Linux with glibc and FreeBSD support adaptive mutexes that spin
      31             :   // for a short number of tries before sleeping.  NSPR's locks did
      32             :   // this, too, and it seems like a reasonable thing to do.
      33             : #if (defined(__linux__) && defined(__GLIBC__)) || defined(__FreeBSD__)
      34             : #define ADAPTIVE_MUTEX_SUPPORTED
      35             : #endif
      36             : 
      37             : #if defined(DEBUG)
      38             : #define ATTR_REQUIRED
      39             : #define MUTEX_KIND PTHREAD_MUTEX_ERRORCHECK
      40             : #elif defined(ADAPTIVE_MUTEX_SUPPORTED)
      41             : #define ATTR_REQUIRED
      42             : #define MUTEX_KIND PTHREAD_MUTEX_ADAPTIVE_NP
      43             : #endif
      44             : 
      45             : #if defined(ATTR_REQUIRED)
      46             :   pthread_mutexattr_t attr;
      47             : 
      48        1411 :   TRY_CALL_PTHREADS(pthread_mutexattr_init(&attr),
      49             :                     "mozilla::detail::MutexImpl::MutexImpl: pthread_mutexattr_init failed");
      50             : 
      51        1411 :   TRY_CALL_PTHREADS(pthread_mutexattr_settype(&attr, MUTEX_KIND),
      52             :                     "mozilla::detail::MutexImpl::MutexImpl: pthread_mutexattr_settype failed");
      53        1411 :   attrp = &attr;
      54             : #endif
      55             : 
      56        1411 :   TRY_CALL_PTHREADS(pthread_mutex_init(&platformData()->ptMutex, attrp),
      57             :                     "mozilla::detail::MutexImpl::MutexImpl: pthread_mutex_init failed");
      58             : 
      59             : #if defined(ATTR_REQUIRED)
      60        1411 :   TRY_CALL_PTHREADS(pthread_mutexattr_destroy(&attr),
      61             :                     "mozilla::detail::MutexImpl::MutexImpl: pthread_mutexattr_destroy failed");
      62             : #endif
      63        1411 : }
      64             : 
      65         498 : mozilla::detail::MutexImpl::~MutexImpl()
      66             : {
      67         249 :   TRY_CALL_PTHREADS(pthread_mutex_destroy(&platformData()->ptMutex),
      68             :                     "mozilla::detail::MutexImpl::~MutexImpl: pthread_mutex_destroy failed");
      69         249 : }
      70             : 
      71             : void
      72      318587 : mozilla::detail::MutexImpl::lock()
      73             : {
      74      318587 :   TRY_CALL_PTHREADS(pthread_mutex_lock(&platformData()->ptMutex),
      75             :                     "mozilla::detail::MutexImpl::lock: pthread_mutex_lock failed");
      76      318669 : }
      77             : 
      78             : void
      79      318531 : mozilla::detail::MutexImpl::unlock()
      80             : {
      81      318531 :   TRY_CALL_PTHREADS(pthread_mutex_unlock(&platformData()->ptMutex),
      82             :                     "mozilla::detail::MutexImpl::unlock: pthread_mutex_unlock failed");
      83      318580 : }
      84             : 
      85             : #undef TRY_CALL_PTHREADS
      86             : 
      87             : mozilla::detail::MutexImpl::PlatformData*
      88      638997 : mozilla::detail::MutexImpl::platformData()
      89             : {
      90             :   static_assert(sizeof(platformData_) >= sizeof(PlatformData),
      91             :                 "platformData_ is too small");
      92      638997 :   return reinterpret_cast<PlatformData*>(platformData_);
      93             : }