common/threads.h

   1 #ifndef AL_THREADS_H
   2 #define AL_THREADS_H
   3
   4 #include <time.h>
   5
   6 #include <mutex>
   7
   8 #if defined(__GNUC__) && defined(__i386__)
   9 /* force_align_arg_pointer is required for proper function arguments aligning
  10  * when SSE code is used. Some systems (Windows, QNX) do not guarantee our
  11  * thread functions will be properly aligned on the stack, even though GCC may
  12  * generate code with the assumption that it is. */
  13 #define FORCE_ALIGN __attribute__((force_align_arg_pointer))
  14 #else
  15 #define FORCE_ALIGN
  16 #endif
  17
  18 #ifdef _WIN32
  19 #define WIN32_LEAN_AND_MEAN
  20 #include <windows.h>
  21 #elif defined(__APPLE__)
  22 #include <dispatch/dispatch.h>
  23 #else
  24 #include <semaphore.h>
  25 #endif
  26
  27 void althrd_setname(const char *name);
  28
  29 namespace al {
  30
  31 class semaphore {
  32 #ifdef _WIN32
  33     using native_type = HANDLE;
  34 #elif defined(__APPLE__)
  35     using native_type = dispatch_semaphore_t;
  36 #else
  37     using native_type = sem_t;
  38 #endif
  39     native_type mSem;
  40
  41 public:
  42     semaphore(unsigned int initial=0);
  43     semaphore(const semaphore&) = delete;
  44     ~semaphore();
  45
  46     semaphore& operator=(const semaphore&) = delete;
  47
  48     void post();
  49     void wait() noexcept;
  50     bool try_wait() noexcept;
  51 };
  52
  53 } // namespace al
  54
  55 #endif /* AL_THREADS_H */