Author: Pekka Riikonen <priikone@silcnet.org>
- Copyright (C) 2006 Pekka Riikonen
+ Copyright (C) 2006 - 2007 Pekka Riikonen
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
*/
-/****h* silcutil/SILC Conditional Variable Interface
+/****h* silcutil/SILC Condition Variable Interface
*
* DESCRIPTION
*
- * A conditional variable interface for multi-thread synchronization.
- * Conditional variables enable threads to suspend execution and yield
+ * A condition variable interface for multi-thread synchronization.
+ * Condition variables enable threads to suspend execution and yield
* the processors until some predicate on some shared data is satisfied.
*
+ * EXAMPLE
+ *
+ * Thread 1:
+ *
+ * // Wait for signal
+ * silc_mutex_lock(lock);
+ * while (c->a == NULL)
+ * silc_cond_wait(cond, lock);
+ * ...
+ * silc_mutex_unlock(lock);
+ *
+ * Thread 2:
+ *
+ * // Signal
+ * silc_mutex_lock(lock);
+ * c->a = context;
+ * silc_cond_signal(cond);
+ * silc_mutex_unlock(lock);
+ *
***/
#ifndef SILCCOND_H
*
* DESCRIPTION
*
- * This context is the actual conditional variable and is allocated
+ * This context is the actual condition variable and is allocated
* by silc_cond_alloc and given as argument to all silc_cond_*
* functions. It is freed by the silc_cond_free function.
*
*
* DESCRIPTION
*
- * Allocates SILC Conditional variable context. The conditional must
+ * Allocates SILC Condition variable context. The condition must
* be allocated before it can be used. It is freed by the
* silc_cond_free function. This returns TRUE and allocated
- * conditional in to the `cond' pointer and FALSE on error.
+ * condition in to the `cond' pointer and FALSE if system is out of
+ * memory.
*
***/
SilcBool silc_cond_alloc(SilcCond *cond);
*
* DESCRIPTION
*
- * Free conditional variable context. If `cond' is NULL this function
+ * Free condition variable context. If `cond' is NULL this function
* has no effect.
*
***/
*
* DESCRIPTION
*
- * Waits for conditional variable `cond' to be signalled. This function
- * will block the calling thread until the conditional variable is
+ * Waits for condition variable `cond' to be signalled. This function
+ * will block the calling thread until the condition variable is
* signalled. The `mutex' must be locked before calling this function.
* The `mutex' will be unlocked inside this function. After this
* function returns the `mutex' is in locked state again.
*
* DESCRIPTION
*
- * Waits for conditional variable `cond' to be signalled or for the
+ * Waits for condition variable `cond' to be signalled or for the
* `timeout' to expire. The timeout is in milliseconds. If it is 0
* no timeout exist. Returns FALSE if timeout expired, TRUE when
* signalled. This function will block the calling thread until the
- * conditional variable is signalled. The `mutex' must be locked before
+ * condition variable is signalled. The `mutex' must be locked before
* calling this function. The `mutex' will be unlocked inside this
* function. After this function returns the `mutex' is in locked
* state again.