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105 lines
2.1 KiB
C
105 lines
2.1 KiB
C
#pragma once
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#include <wut.h>
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#include "threadqueue.h"
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/**
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* \defgroup coreinit_semaphore Semaphore
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* \ingroup coreinit
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*
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* Similar to Windows <a href="https://msdn.microsoft.com/en-us/library/windows/desktop/ms685129(v=vs.85).aspx">Semaphore Objects</a>.
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* @{
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct OSSemaphore OSSemaphore;
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#define OS_SEMAPHORE_TAG 0x73506852u
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struct OSSemaphore
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{
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//! Should always be set to the value OS_SEMAPHORE_TAG.
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uint32_t tag;
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//! Name set by OSInitMutexEx.
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const char *name;
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UNKNOWN(4);
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//! Current count of semaphore
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int32_t count;
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//! Queue of threads waiting on semaphore object with OSWaitSemaphore
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OSThreadQueue queue;
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};
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CHECK_OFFSET(OSSemaphore, 0x00, tag);
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CHECK_OFFSET(OSSemaphore, 0x04, name);
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CHECK_OFFSET(OSSemaphore, 0x0C, count);
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CHECK_OFFSET(OSSemaphore, 0x10, queue);
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CHECK_SIZE(OSSemaphore, 0x20);
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/**
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* Initialise semaphore object with count.
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*/
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void
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OSInitSemaphore(OSSemaphore *semaphore,
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int32_t count);
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/**
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* Initialise semaphore object with count and name.
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*/
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void
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OSInitSemaphoreEx(OSSemaphore *semaphore,
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int32_t count,
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const char *name);
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/**
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* Get the current semaphore count.
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*/
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int32_t
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OSGetSemaphoreCount(OSSemaphore *semaphore);
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/**
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* Increase the semaphore value.
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*
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* If any threads are waiting for semaphore, they are woken.
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*/
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int32_t
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OSSignalSemaphore(OSSemaphore *semaphore);
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/**
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* Decrease the semaphore value.
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*
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* If the value is less than or equal to zero the current thread will be put to
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* sleep until the count is above zero and it can decrement it safely.
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*/
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int32_t
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OSWaitSemaphore(OSSemaphore *semaphore);
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/**
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* Try to decrease the semaphore value.
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*
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* If the value is greater than zero then it will be decremented, else the function
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* will return immediately with a value <= 0 indicating a failure.
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*
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* \return Returns previous semaphore count, before the decrement in this function.
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* If the value is >0 then it means the call was succesful.
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*/
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int32_t
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OSTryWaitSemaphore(OSSemaphore *semaphore);
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#ifdef __cplusplus
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}
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#endif
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/** @} */
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