common/threads.cpp

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 1999-2007 by authors.
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc.,
  17  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include "config.h"
  22
  23 #include "threads.h"
  24
  25 #include <limits>
  26 #include <system_error>
  27
  28
  29 #ifdef _WIN32
  30
  31 void althrd_setname(const char *name)
  32 {
  33 #if defined(_MSC_VER)
  34 #define MS_VC_EXCEPTION 0x406D1388
  35 #pragma pack(push,8)
  36     struct {
  37         DWORD dwType;     // Must be 0x1000.
  38         LPCSTR szName;    // Pointer to name (in user addr space).
  39         DWORD dwThreadID; // Thread ID (-1=caller thread).
  40         DWORD dwFlags;    // Reserved for future use, must be zero.
  41     } info;
  42 #pragma pack(pop)
  43     info.dwType = 0x1000;
  44     info.szName = name;
  45     info.dwThreadID = -1;
  46     info.dwFlags = 0;
  47
  48     __try {
  49         RaiseException(MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(ULONG_PTR), (ULONG_PTR*)&info);
  50     }
  51     __except(EXCEPTION_CONTINUE_EXECUTION) {
  52     }
  53 #undef MS_VC_EXCEPTION
  54 #else
  55     (void)name;
  56 #endif
  57 }
  58
  59 namespace al {
  60
  61 semaphore::semaphore(unsigned int initial)
  62 {
  63     if(initial > static_cast<unsigned int>(std::numeric_limits<int>::max()))
  64         throw std::system_error(std::make_error_code(std::errc::value_too_large));
  65     mSem = CreateSemaphore(nullptr, initial, std::numeric_limits<int>::max(), nullptr);
  66     if(mSem == nullptr)
  67         throw std::system_error(std::make_error_code(std::errc::resource_unavailable_try_again));
  68 }
  69
  70 semaphore::~semaphore()
  71 { CloseHandle(mSem); }
  72
  73 void semaphore::post()
  74 {
  75     if(!ReleaseSemaphore(mSem, 1, nullptr))
  76         throw std::system_error(std::make_error_code(std::errc::value_too_large));
  77 }
  78
  79 void semaphore::wait() noexcept
  80 { WaitForSingleObject(mSem, INFINITE); }
  81
  82 bool semaphore::try_wait() noexcept
  83 { return WaitForSingleObject(mSem, 0) == WAIT_OBJECT_0; }
  84
  85 } // namespace al
  86
  87 #else
  88
  89 #include <errno.h>
  90 #include <pthread.h>
  91 #ifdef HAVE_PTHREAD_NP_H
  92 #include <pthread_np.h>
  93 #endif
  94
  95 void althrd_setname(const char *name)
  96 {
  97 #if defined(HAVE_PTHREAD_SETNAME_NP)
  98 #if defined(PTHREAD_SETNAME_NP_ONE_PARAM)
  99     pthread_setname_np(name);
 100 #elif defined(PTHREAD_SETNAME_NP_THREE_PARAMS)
 101     pthread_setname_np(pthread_self(), "%s", (void*)name);
 102 #else
 103     pthread_setname_np(pthread_self(), name);
 104 #endif
 105 #elif defined(HAVE_PTHREAD_SET_NAME_NP)
 106     pthread_set_name_np(pthread_self(), name);
 107 #else
 108     (void)name;
 109 #endif
 110 }
 111
 112 namespace al {
 113
 114 #ifdef __APPLE__
 115
 116 semaphore::semaphore(unsigned int initial)
 117 {
 118     mSem = dispatch_semaphore_create(initial);
 119     if(!mSem)
 120         throw std::system_error(std::make_error_code(std::errc::resource_unavailable_try_again));
 121 }
 122
 123 semaphore::~semaphore()
 124 { dispatch_release(mSem); }
 125
 126 void semaphore::post()
 127 { dispatch_semaphore_signal(mSem); }
 128
 129 void semaphore::wait() noexcept
 130 { dispatch_semaphore_wait(mSem, DISPATCH_TIME_FOREVER); }
 131
 132 bool semaphore::try_wait() noexcept
 133 { return dispatch_semaphore_wait(mSem, DISPATCH_TIME_NOW) == 0; }
 134
 135 #else /* !__APPLE__ */
 136
 137 semaphore::semaphore(unsigned int initial)
 138 {
 139     if(sem_init(&mSem, 0, initial) != 0)
 140         throw std::system_error(std::make_error_code(std::errc::resource_unavailable_try_again));
 141 }
 142
 143 semaphore::~semaphore()
 144 { sem_destroy(&mSem); }
 145
 146 void semaphore::post()
 147 {
 148     if(sem_post(&mSem) != 0)
 149         throw std::system_error(std::make_error_code(std::errc::value_too_large));
 150 }
 151
 152 void semaphore::wait() noexcept
 153 {
 154     while(sem_wait(&mSem) == -1 && errno == EINTR) {
 155     }
 156 }
 157
 158 bool semaphore::try_wait() noexcept
 159 { return sem_trywait(&mSem) == 0; }
 160
 161 #endif /* __APPLE__ */
 162
 163 } // namespace al
 164
 165 #endif /* _WIN32 */