common/threads.h

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