Class threads.thread.sem
Lua thread semaphore creation and manipulation methods.
Functions
| init ( ) | Initialize a new semaphore. |
| wait ( sem ) | Wait on a semaphore. |
| wait ( sem ) | Attempt a wait on a semaphore. |
| post ( sem ) | Post a semaphore. |
| destroy ( sem ) | Destroy an initialized semaphore and free its resources. |
Functions
- init ( pshared, initial )
- Initialize a new semaphore.
Parameters
- pshared: share semaphore among processes.
- initial: inital state (number of accesses).
Usage:
local sem = thread.sem.init(1,2);Return value:
Initialized mutex, null on failure. - wait ( sem )
- Wait on a semaphore.
Parameters
- sem: Initialized semaphore
Usage:
thread.sem.wait(sem);Return value:
0 semaphore obtianed, 1 failed to obtain semaphore. - trywait ( sem )
- Attempt a wait on a semaphore.
Parameters
- sem: Initialized semaphore.
Usage
thread.sem.trywait(sem);Return value:
0 semaphore obtianed, 1 failed to obtain semaphore.See also:
- post ( sem )
- Post a semaphore.
Parameters
- sem: Initialized semaphore.
Usage
thread.sem.post(sem);Return value:
0 semaphore released, 1 failed to release semaphore. - destroy ( sem )
- Destroy an initialized semaphore and free its resources.
Parameters
- sem: Initialized semaphore
Usage:
thread.sem.destroy(sem);Return value:
0 semaphore destroyed, 1 failed to destroy semaphore.