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 #if defined(__APPLE__)
  15 #include <dispatch/dispatch.h>
  16 #elif !defined(_WIN32)
  17 #include <semaphore.h>
  18 #endif
  19
  20 void althrd_setname(const char *name);
  21
  22 namespace al {
  23
  24 class semaphore {
  25 #ifdef _WIN32
  26     using native_type = void*;
  27 #elif defined(__APPLE__)
  28     using native_type = dispatch_semaphore_t;
  29 #else
  30     using native_type = sem_t;
  31 #endif
  32     native_type mSem;
  33
  34 public:
  35     semaphore(unsigned int initial=0);
  36     semaphore(const semaphore&) = delete;
  37     ~semaphore();
  38
  39     semaphore& operator=(const semaphore&) = delete;
  40
  41     void post();
  42     void wait() noexcept;
  43     bool try_wait() noexcept;
  44 };
  45
  46 } // namespace al
  47
  48 #endif /* AL_THREADS_H */