diff options
Diffstat (limited to 'doc/src/snippets/code/src_corelib_thread_qsemaphore.cpp')
-rw-r--r-- | doc/src/snippets/code/src_corelib_thread_qsemaphore.cpp | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/doc/src/snippets/code/src_corelib_thread_qsemaphore.cpp b/doc/src/snippets/code/src_corelib_thread_qsemaphore.cpp new file mode 100644 index 0000000..e02f05e --- /dev/null +++ b/doc/src/snippets/code/src_corelib_thread_qsemaphore.cpp @@ -0,0 +1,33 @@ +//! [0] +QSemaphore sem(5); // sem.available() == 5 + +sem.acquire(3); // sem.available() == 2 +sem.acquire(2); // sem.available() == 0 +sem.release(5); // sem.available() == 5 +sem.release(5); // sem.available() == 10 + +sem.tryAcquire(1); // sem.available() == 9, returns true +sem.tryAcquire(250); // sem.available() == 9, returns false +//! [0] + + +//! [1] +QSemaphore sem(5); // a semaphore that guards 5 resources +sem.acquire(5); // acquire all 5 resources +sem.release(5); // release the 5 resources +sem.release(10); // "create" 10 new resources +//! [1] + + +//! [2] +QSemaphore sem(5); // sem.available() == 5 +sem.tryAcquire(250); // sem.available() == 5, returns false +sem.tryAcquire(3); // sem.available() == 2, returns true +//! [2] + + +//! [3] +QSemaphore sem(5); // sem.available() == 5 +sem.tryAcquire(250, 1000); // sem.available() == 5, waits 1000 milliseconds and returns false +sem.tryAcquire(3, 30000); // sem.available() == 2, returns true without waiting +//! [3] |