90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
/**
|
|
* PROJECT: ExectOS
|
|
* COPYRIGHT: See COPYING.md in the top level directory
|
|
* FILE: xtoskrnl/ke/semphore.c
|
|
* DESCRIPTION: Semaphores support
|
|
* DEVELOPERS: Rafal Kupiec <belliash@codingworkshop.eu.org>
|
|
*/
|
|
|
|
#include <xtos.h>
|
|
|
|
|
|
/**
|
|
* initializes a kernel semaphore object.
|
|
*
|
|
* @param Semaphore
|
|
* Supplies a pointer to a semaphore object.
|
|
*
|
|
* @param Count
|
|
* Specifies the initial count value of the semaphore.
|
|
*
|
|
* @param Limit
|
|
* Specifies a maximum count value of the semaphore.
|
|
*
|
|
* @return This routine does not return any value.
|
|
*
|
|
* @since NT 3.5
|
|
*/
|
|
XTAPI
|
|
VOID
|
|
KeInitializeSemaphore(IN PKSEMAPHORE Semaphore,
|
|
IN LONG Count,
|
|
IN LONG Limit)
|
|
{
|
|
/* Initialize semaphore header and limit */
|
|
Semaphore->Header.Type = SemaphoreObject;
|
|
Semaphore->Header.SignalState = Count;
|
|
Semaphore->Limit = Limit;
|
|
|
|
/* Initialize semaphore wait list */
|
|
RtlInitializeListHead(&Semaphore->Header.WaitListHead);
|
|
}
|
|
|
|
/**
|
|
* Reads semaphore's current signal state.
|
|
*
|
|
* @param Semaphore
|
|
* Supplies a pointer to a semaphore object.
|
|
*
|
|
* @return This routine returns the current signal state of the semaphore.
|
|
*
|
|
* @since XT 1.0
|
|
*/
|
|
XTAPI
|
|
LONG
|
|
KeReadSemaphoreState(IN PKSEMAPHORE Semaphore)
|
|
{
|
|
/* Return semaphore's signal state */
|
|
return Semaphore->Header.SignalState;
|
|
}
|
|
|
|
/**
|
|
* Releases a semaphore.
|
|
*
|
|
* @param Semaphore
|
|
* Supplies a pointer to a semaphore object.
|
|
*
|
|
* @param Increment
|
|
* Specifies the priority increment value of the semaphore.
|
|
*
|
|
* @param Adjustment
|
|
* Specifies adjustment value added to the semaphore's initial count value.
|
|
*
|
|
* @param Wait
|
|
* Determines whether release of the semaphore will be followed by a kernel wait routine call or not.
|
|
*
|
|
* @return This routine returns a previous signal state of the semaphore.
|
|
*
|
|
* @since NT 3.5
|
|
*/
|
|
XTAPI
|
|
LONG
|
|
KeReleaseSemaphore(IN PKSEMAPHORE Semaphore,
|
|
IN KPRIORITY Increment,
|
|
IN LONG Adjustment,
|
|
IN BOOLEAN Wait)
|
|
{
|
|
UNIMPLEMENTED;
|
|
return 0;
|
|
}
|