150     semaphore(int start_cnt_ = 0) { my_sem = dispatch_semaphore_create(start_cnt_); }
152     ~semaphore() { dispatch_release(my_sem); }  in ~semaphore()
155         std::intptr_t ret = dispatch_semaphore_wait(my_sem, DISPATCH_TIME_FOREVER);  in P()
159     void V() { dispatch_semaphore_signal(my_sem); }  in V()
161     dispatch_semaphore_t my_sem;
200     binary_semaphore() { my_sem = CreateEventEx( nullptr, nullptr, 0, EVENT_ALL_ACCESS );  }  in binary_semaphore()
202     ~binary_semaphore() { CloseHandle( my_sem ); }  in ~binary_semaphore()
204     void P() { WaitForSingleObjectEx( my_sem, INFINITE, FALSE ); }  in P()
206     void V() { SetEvent( my_sem ); }  in V()
208     HANDLE my_sem;
229     srwl_or_handle my_sem;
243     binary_semaphore() { my_sem = 1; }  in binary_semaphore()
249         if( !my_sem.compare_exchange_strong( s, 1 ) ) {  in P()
251                 s = my_sem.exchange( 2 );  in P()
253                 futex_wait( &my_sem, 2 );  in P()
254                 s = my_sem.exchange( 2 );  in P()
260         __TBB_ASSERT( my_sem.load(std::memory_order_relaxed)>=1, "multiple V()'s in a row?" );  in V()
261         if( my_sem.exchange( 0 )==2 )  in V()
262             futex_wakeup_one( &my_sem );  in V()
265     std::atomic<int> my_sem; // 0 - open; 1 - closed, no waits; 2 - closed, possible waits
274         int ret = sem_init( &my_sem, /*shared among threads*/ 0, 0 );  in binary_semaphore()
279         int ret = sem_destroy( &my_sem );  in ~binary_semaphore()
284         while( sem_wait( &my_sem )!=0 )  in P()
288     void V() { sem_post( &my_sem ); }  in V()
290     sem_t my_sem;