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