scheduler/semaphore.c

   1 /*
   2  * Win32 semaphores
   3  *
   4  * Copyright 1998 Alexandre Julliard
   5  */
   6
   7 #include <assert.h>
   8 #include <string.h>
   9 #include "winerror.h"
  10 #include "server.h"
  11
  12
  13 /***********************************************************************
  14  *           CreateSemaphore32A   (KERNEL32.174)
  15  */
  16 HANDLE WINAPI CreateSemaphoreA( SECURITY_ATTRIBUTES *sa, LONG initial, LONG max, LPCSTR name )
  17 {
  18     struct create_semaphore_request *req = get_req_buffer();
  19
  20     /* Check parameters */
  21
  22     if ((max <= 0) || (initial < 0) || (initial > max))
  23     {
  24         SetLastError( ERROR_INVALID_PARAMETER );
  25         return 0;
  26     }
  27
  28     req->initial = (unsigned int)initial;
  29     req->max     = (unsigned int)max;
  30     req->inherit = (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle);
  31     server_strcpyAtoW( req->name, name );
  32     SetLastError(0);
  33     server_call( REQ_CREATE_SEMAPHORE );
  34     if (req->handle == -1) return 0;
  35     return req->handle;
  36 }
  37
  38
  39 /***********************************************************************
  40  *           CreateSemaphore32W   (KERNEL32.175)
  41  */
  42 HANDLE WINAPI CreateSemaphoreW( SECURITY_ATTRIBUTES *sa, LONG initial,
  43                                     LONG max, LPCWSTR name )
  44 {
  45     struct create_semaphore_request *req = get_req_buffer();
  46
  47     /* Check parameters */
  48
  49     if ((max <= 0) || (initial < 0) || (initial > max))
  50     {
  51         SetLastError( ERROR_INVALID_PARAMETER );
  52         return 0;
  53     }
  54
  55     req->initial = (unsigned int)initial;
  56     req->max     = (unsigned int)max;
  57     req->inherit = (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle);
  58     server_strcpyW( req->name, name );
  59     SetLastError(0);
  60     server_call( REQ_CREATE_SEMAPHORE );
  61     if (req->handle == -1) return 0;
  62     return req->handle;
  63 }
  64
  65
  66 /***********************************************************************
  67  *           OpenSemaphore32A   (KERNEL32.545)
  68  */
  69 HANDLE WINAPI OpenSemaphoreA( DWORD access, BOOL inherit, LPCSTR name )
  70 {
  71     struct open_semaphore_request *req = get_req_buffer();
  72
  73     req->access  = access;
  74     req->inherit = inherit;
  75     server_strcpyAtoW( req->name, name );
  76     server_call( REQ_OPEN_SEMAPHORE );
  77     if (req->handle == -1) return 0; /* must return 0 on failure, not -1 */
  78     return req->handle;
  79 }
  80
  81
  82 /***********************************************************************
  83  *           OpenSemaphore32W   (KERNEL32.546)
  84  */
  85 HANDLE WINAPI OpenSemaphoreW( DWORD access, BOOL inherit, LPCWSTR name )
  86 {
  87     struct open_semaphore_request *req = get_req_buffer();
  88
  89     req->access  = access;
  90     req->inherit = inherit;
  91     server_strcpyW( req->name, name );
  92     server_call( REQ_OPEN_SEMAPHORE );
  93     if (req->handle == -1) return 0; /* must return 0 on failure, not -1 */
  94     return req->handle;
  95 }
  96
  97
  98 /***********************************************************************
  99  *           ReleaseSemaphore   (KERNEL32.583)
 100  */
 101 BOOL WINAPI ReleaseSemaphore( HANDLE handle, LONG count, LONG *previous )
 102 {
 103     BOOL ret = FALSE;
 104     struct release_semaphore_request *req = get_req_buffer();
 105
 106     if (count < 0)
 107     {
 108         SetLastError( ERROR_INVALID_PARAMETER );
 109         return FALSE;
 110     }
 111     req->handle = handle;
 112     req->count  = (unsigned int)count;
 113     if (!server_call( REQ_RELEASE_SEMAPHORE ))
 114     {
 115         if (previous) *previous = req->prev_count;
 116         ret = TRUE;
 117     }
 118     return ret;
 119 }