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+/*
+ * The MIT License
+ *
+ * Copyright (C) 2010-2016 Alexander Saprykin <saprykin.spb@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * 'Software'), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * @file pcondvariable.h
+ * @brief Condition variable
+ * @author Alexander Saprykin
+ *
+ * A condition variable is an inter-thread synchronization primitive, often
+ * used in the classical 'producers-consumers' concurrent data access models.
+ *
+ * The main idea is to notify waiting thread(s) for some events before they
+ * can enter a critical section. Hence the name of the primitive: a thread
+ * enters the critical section upon an accomplished condition. Compare it with a
+ * mutex where the thread enters the critical section as soon as no one holds a
+ * lock.
+ *
+ * Several threads can be notified at once, but only one of them can enter the
+ * critical section. The order of the threads in that case is implementation
+ * dependent.
+ *
+ * As the thread enters the critical section upon a condition it still requires
+ * a mutex to guard its code against concurrent access from other threads. The
+ * mutex provided in pair with a condition variable will be automatically locked
+ * on the condition, the thread should unlock it explicitly after leaving the
+ * critical section. That mutex is unlocked while waiting for the condition and
+ * should be locked prior calling the condition waiting routine.
+ *
+ * The waiting thread behavior: create a new condition variable with
+ * p_cond_variable_new(), create and lock a mutex before a critical section and
+ * wait for a signal from another thread on this condition variable
+ * using p_cond_variable_wait().
+ *
+ * The signaling thread behavior: upon reaching event time emit a signal with
+ * p_cond_variable_signal() to wake up a single waiting thread or
+ * p_cond_variable_broadcast() to wake up all the waiting threads.
+ *
+ * After emitting the signal only the one thread will get the locked mutex back
+ * to continue executing the critical section.
+ *
+ * It is implementation dependent whether a thread will receive a missed signal
+ * (when a notification from the one thread was emitted prior another thread has
+ * been called for waiting), so do not rely on this behavior.
+ */
+
+#if !defined (PLIBSYS_H_INSIDE) && !defined (PLIBSYS_COMPILATION)
+#  error "Header files shouldn't be included directly, consider using <plibsys.h> instead."
+#endif
+
+#ifndef PLIBSYS_HEADER_PCONDVARIABLE_H
+#define PLIBSYS_HEADER_PCONDVARIABLE_H
+
+#include <pmacros.h>
+#include <ptypes.h>
+#include <pmutex.h>
+
+P_BEGIN_DECLS
+
+/** Condition variable opaque data structure. */
+typedef struct PCondVariable_ PCondVariable;
+
+/**
+ * @brief Creates a new #PCondVariable.
+ * @return Pointer to a newly created #PCondVariable structure, or NULL if
+ * failed.
+ * @since 0.0.1
+ */
+P_LIB_API PCondVariable *	p_cond_variable_new		(void);
+
+/**
+ * @brief Frees #PCondVariable structure.
+ * @param cond Condtion variable to free.
+ * @since 0.0.1
+ */
+P_LIB_API void			p_cond_variable_free		(PCondVariable	*cond);
+
+/**
+ * @brief Waits for a signal on a given condition variable.
+ * @param cond Condition variable to wait on.
+ * @param mutex Locked mutex which will remain locked after waiting.
+ * @return TRUE on success, FALSE otherwise.
+ * @since 0.0.1
+ *
+ * The calling thread will sleep until the signal on @a cond arrived.
+ */
+P_LIB_API pboolean		p_cond_variable_wait		(PCondVariable	*cond,
+								 PMutex		*mutex);
+
+/**
+ * @brief Emitts a signal on a given condition variable for one waiting thread.
+ * @param cond Condition variable to emit the signal on.
+ * @return TRUE on success, FALSE otherwise.
+ * @since 0.0.1
+ *
+ * After emitting the signal only the one thread waiting for it will be waken
+ * up. Do not rely on a queue concept for waiting threads. Though the
+ * implementation is intended to be much close to a queue, it's not fairly
+ * enough. Due that any thread can be waken up, even if it has just called
+ * p_cond_variable_wait() while there are other waiting threads.
+ */
+P_LIB_API pboolean		p_cond_variable_signal		(PCondVariable	*cond);
+
+/**
+ * @brief Emitts a signal on a given condition variable for all the waiting
+ * threads.
+ * @param cond Condition variable to emit the signal on.
+ * @return TRUE on success, FALSE otherwise.
+ * @since 0.0.1
+ *
+ * After emitting the signal all the threads waiting for it will be waken up.
+ */
+P_LIB_API pboolean		p_cond_variable_broadcast	(PCondVariable	*cond);
+
+P_END_DECLS
+
+#endif /* PLIBSYS_HEADER_PCONDVARIABLE_H */