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// IBM_PROLOG_BEGIN_TAG
// This is an automatically generated prolog.
//
// $Source: src/include/sys/sync.h $
//
// IBM CONFIDENTIAL
//
// COPYRIGHT International Business Machines Corp. 2011
//
// p1
//
// Object Code Only (OCO) source materials
// Licensed Internal Code Source Materials
// IBM HostBoot Licensed Internal Code
//
// The source code for this program is not published or other-
// wise divested of its trade secrets, irrespective of what has
// been deposited with the U.S. Copyright Office.
//
// Origin: 30
//
// IBM_PROLOG_END
#ifndef SYNC
#define SYNC
#include <stdint.h>
/**
* Mutex object type
*/
struct _futex_imp_t
{
uint64_t iv_val;
};
typedef _futex_imp_t mutex_t;
/**
* Barrier object type
*/
struct _barrier_imp_t
{
mutex_t iv_mutex;
uint64_t iv_event;
uint64_t iv_missing;
uint64_t iv_count;
};
typedef _barrier_imp_t barrier_t;
#define MUTEX_INITIALIZER {0}
/**
* Conditional variable types
*/
struct _cond_imp_t
{
mutex_t * mutex;
uint64_t sequence;
};
typedef _cond_imp_t sync_cond_t;
#define COND_INITIALIZER {NULL, 0}
enum _FUTEX_OP
{
FUTEX_WAIT,
FUTEX_WAKE,
FUTEX_REQUEUE
};
/**
* @fn barrier_init
* @brief Initialize a barrier object
* @param[out] o_barrier The barrier
* @param[in] i_count The number of tasks to wait on
* @pre an uninitialized barrier object
* @post a valid barrier object
*/
void barrier_init (barrier_t * o_barrier, uint64_t i_count);
/**
* @fn barrier_destroy
* @brief Destroy a barrier
* @param[in] i_barrier The barrier
*/
void barrier_destroy (barrier_t * i_barrier);
/**
* @fn barrier_wait
* @brief Wait on a barrier
* This tasks will block until the barrier count is reached.
* @param[in] i_barrier The barrier
*/
void barrier_wait (barrier_t * i_barrier);
/**
* @fn mutex_init
* @brief Initialize a mutex object
* @param[out] o_mutex the mutex
* @pre an uninitialized mutex object
* @post a valid mutex object
*/
void mutex_init(mutex_t * o_mutex);
/**
* @fn mutex_destroy
* @brief Destroy / uninitialize a mutex object.
* @param[in] i_mutex - the mutex
* @note This does not free the memory associated with the object if the mutex
* was allocated off the heap.
*/
void mutex_destroy(mutex_t * i_mutex);
/**
* @fn mutex_lock
* @brief Obtain a lock on a mutex
* @param[in] i_mutex - The mutex
* @post returns when this task has the lock
*/
void mutex_lock(mutex_t * i_mutex);
/**
* @fn mutex_unlock
* @brief Release a lock on a mutex
* @param[in] i_mutex - the mutex
* @post mutex lock released
*/
void mutex_unlock(mutex_t * i_mutex);
/**
* @fn sync_cond_init
* @brief Initialize a condtional variable
* @param i_cond, The conditional variable
* @post
*/
void sync_cond_init(sync_cond_t * i_cond);
/**
* @fn sync_cond_destroy
* @brief Destroy a conditional variable
* @param i_cond, The conditional variable
*/
void sync_cond_destroy(sync_cond_t * i_cond);
/**
* @fn sync_cond_wait
* @brief Block the calling task until the specified condition is signaled
* @param i_cond, The condition variable
* @param i_mutex, A mutex for which this task has the lock
* @pre This task must have the mutex lock
* @post This task will have the mutex lock
* @note i_mutex will be unlocked while this task is in the wait state.
* @note failing to lock the mutex before calling this function may cause it
* not to block
*/
int sync_cond_wait(sync_cond_t * i_cond, mutex_t * i_mutex);
/**
* @fn sync_cond_signal
* @brief Signal to wake a task waiting on the condition varible.
* @param i_cond, The condition variable
* @pre This task must hold the lock on the mutex used in sync_cond_wait()
* @pre sync_cond_wait() must have been called for conditional variable
* @note failing to unlock the mutex after this call may cause the waiting
* task to remain blocked. If there is more than one task waiting on the
* conditional variable then sync_cond_broadcast() should be used instead.
*/
void sync_cond_signal(sync_cond_t * i_cond);
/**
* @fn sync_cond_broadcast
* @brief Signal to wake all tasks waiting on the condition variable
* @param i_cond, The conditional variable
* @note same restrictions as sync_cond_signal() except this function should
* be used if there is more than one task waiting on the conditional variable.
* There is no guarantee on which waiting task will get the mutex lock first
* when this task unlocks the mutex.
*/
void sync_cond_broadcast(sync_cond_t * i_cond);
#endif
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