Sweden-Number/scheduler/semaphore.c

141 lines
4.3 KiB
C

/*
* Win32 semaphores
*
* Copyright 1998 Alexandre Julliard
*/
#include <assert.h>
#include "winerror.h"
#include "k32obj.h"
#include "process.h"
#include "thread.h"
#include "heap.h"
#include "server/request.h"
#include "server.h"
typedef struct
{
K32OBJ header;
} SEMAPHORE;
/***********************************************************************
* CreateSemaphore32A (KERNEL32.174)
*/
HANDLE WINAPI CreateSemaphoreA( SECURITY_ATTRIBUTES *sa, LONG initial,
LONG max, LPCSTR name )
{
struct create_semaphore_request req;
struct create_semaphore_reply reply;
int len = name ? strlen(name) + 1 : 0;
HANDLE handle;
SEMAPHORE *sem;
/* Check parameters */
if ((max <= 0) || (initial < 0) || (initial > max))
{
SetLastError( ERROR_INVALID_PARAMETER );
return 0;
}
req.initial = (unsigned int)initial;
req.max = (unsigned int)max;
req.inherit = (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle);
CLIENT_SendRequest( REQ_CREATE_SEMAPHORE, -1, 2, &req, sizeof(req), name, len );
CLIENT_WaitSimpleReply( &reply, sizeof(reply), NULL );
if (reply.handle == -1) return 0;
SYSTEM_LOCK();
sem = (SEMAPHORE *)K32OBJ_Create( K32OBJ_SEMAPHORE, sizeof(*sem),
name, reply.handle, SEMAPHORE_ALL_ACCESS,
sa, &handle);
if (sem) K32OBJ_DecCount( &sem->header );
SYSTEM_UNLOCK();
if (handle == INVALID_HANDLE_VALUE) handle = 0;
return handle;
}
/***********************************************************************
* CreateSemaphore32W (KERNEL32.175)
*/
HANDLE WINAPI CreateSemaphoreW( SECURITY_ATTRIBUTES *sa, LONG initial,
LONG max, LPCWSTR name )
{
LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
HANDLE ret = CreateSemaphoreA( sa, initial, max, nameA );
if (nameA) HeapFree( GetProcessHeap(), 0, nameA );
return ret;
}
/***********************************************************************
* OpenSemaphore32A (KERNEL32.545)
*/
HANDLE WINAPI OpenSemaphoreA( DWORD access, BOOL inherit, LPCSTR name )
{
HANDLE handle = 0;
K32OBJ *obj;
struct open_named_obj_request req;
struct open_named_obj_reply reply;
int len = name ? strlen(name) + 1 : 0;
req.type = OPEN_SEMAPHORE;
req.access = access;
req.inherit = inherit;
CLIENT_SendRequest( REQ_OPEN_NAMED_OBJ, -1, 2, &req, sizeof(req), name, len );
CLIENT_WaitSimpleReply( &reply, sizeof(reply), NULL );
if (reply.handle != -1)
{
SYSTEM_LOCK();
if ((obj = K32OBJ_FindNameType( name, K32OBJ_SEMAPHORE )) != NULL)
{
handle = HANDLE_Alloc( PROCESS_Current(), obj, access, inherit, reply.handle );
K32OBJ_DecCount( obj );
if (handle == INVALID_HANDLE_VALUE)
handle = 0; /* must return 0 on failure, not -1 */
}
else CLIENT_CloseHandle( reply.handle );
SYSTEM_UNLOCK();
}
return handle;
}
/***********************************************************************
* OpenSemaphore32W (KERNEL32.546)
*/
HANDLE WINAPI OpenSemaphoreW( DWORD access, BOOL inherit, LPCWSTR name )
{
LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
HANDLE ret = OpenSemaphoreA( access, inherit, nameA );
if (nameA) HeapFree( GetProcessHeap(), 0, nameA );
return ret;
}
/***********************************************************************
* ReleaseSemaphore (KERNEL32.583)
*/
BOOL WINAPI ReleaseSemaphore( HANDLE handle, LONG count, LONG *previous )
{
struct release_semaphore_request req;
struct release_semaphore_reply reply;
if (count < 0)
{
SetLastError( ERROR_INVALID_PARAMETER );
return FALSE;
}
req.handle = HANDLE_GetServerHandle( PROCESS_Current(), handle,
K32OBJ_SEMAPHORE, SEMAPHORE_MODIFY_STATE );
if (req.handle == -1) return FALSE;
req.count = (unsigned int)count;
CLIENT_SendRequest( REQ_RELEASE_SEMAPHORE, -1, 1, &req, sizeof(req) );
if (CLIENT_WaitSimpleReply( &reply, sizeof(reply), NULL )) return FALSE;
if (previous) *previous = reply.prev_count;
return TRUE;
}