Changeset 619 for trunk/libs/libsemaphore/semaphore.h

Timestamp:

Feb 12, 2019, 1:15:47 PM (5 years ago)

Author:

alain

Message:

1) Fix a bug in KSH : after the "load" command,

the [ksh] prompt is now printed after completion
of the loaded application.

2) Fix a bug in vmm_handle_cow() : the copy-on-write

use now a hal_remote_memcpy() to replicate the page content.

File:

• trunk/libs/libsemaphore/semaphore.h (modified) (2 diffs)

trunk/libs/libsemaphore/semaphore.h

@@ -27 +27 @@
 //////////////////////////////////////////////////////////////////////////////////////////////
 //             POSIX unnamed semaphores related functions
+//
+// This synchonisation object allows several thread in a given process to share one
+// (or several) shared resource(s).
+// - The sem_wait() function allows a thread to take one resource and atomically
+//   decrement the semaphore count. If the count value is zero, the calling thread 
+//   blocks and deschedules. It is unblocked by another thread when it becomes possible
+//   to make the decrement.
+// - the sem_post() functions allows a thread to release a resource and atomicalli
+//   increment the semaphore count. 
 //////////////////////////////////////////////////////////////////////////////////////////////
 
@@ -37 +46 @@
  * @ sem         : [in]  pointer on semaphore.
  * @ pshared     : [in]  unsupported => must be zero. 
- * @ value       : [in]  initial semaphore value.
+ * @ count       : [in]  initial semaphore value.
  * @ return 0 if success / return -1 if failure.
  ********************************************************************************************/
 int sem_init( sem_t        * sem,
               int            pshared,
-              unsigned int   value );
+              unsigned int   count );
 
 /*********************************************************************************************