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/**
* @file condvar.h
* @brief Condition variable synchronization primitive.
* @author plutoo
* @copyright libnx Authors
*/
#pragma once
#include "../types.h"
#include "../kernel/mutex.h"
/// Condition variable structure.
typedef struct {
u32 tag;
Mutex* mutex;
} CondVar;
/**
* @brief Initializes a condition variable.
* @param[in] c Condition variable object.
* @param[in] m Mutex object to use inside the condition variable.
*/
void condvarInit(CondVar* c, Mutex* m);
/**
* @brief Waits on a condition variable with a timeout.
* @param[in] c Condition variable object.
* @param[in] timeout Timeout in nanoseconds.
* @return Result code (0xEA01 on timeout).
* @remark On function return, the underlying mutex is acquired.
*/
Result condvarWaitTimeout(CondVar* c, u64 timeout);
/**
* @brief Waits on a condition variable.
* @param[in] c Condition variable object.
* @return Result code.
* @remark On function return, the underlying mutex is acquired.
*/
static inline Result condvarWait(CondVar* c);//{
// return condvarWaitTimeout(c, -1ull);
//}
/**
* @brief Wakes up up to the specified number of threads waiting on a condition variable.
* @param[in] c Condition variable object.
* @param[in] num Maximum number of threads to wake up (or -1 to wake them all up).
* @return Result code.
*/
Result condvarWake(CondVar* c, int num);
/**
* @brief Wakes up a single thread waiting on a condition variable.
* @param[in] c Condition variable object.
* @return Result code.
*/
static inline Result condvarWakeOne(CondVar* c);//{
// return condvarWake(c, 1);
//}
/**
* @brief Wakes up all thread waiting on a condition variable.
* @param[in] c Condition variable object.
* @return Result code.
*/
static inline Result condvarWakeAll(CondVar* c);//{
// return condvarWake(c, -1);
//}
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