scheduler/event.c

   1 /*
   2  * Win32 events
   3  *
   4  * Copyright 1998 Alexandre Julliard
   5  */
   6
   7 #include <assert.h>
   8 #include <string.h>
   9 #include "winerror.h"
  10 #include "heap.h"
  11 #include "syslevel.h"
  12 #include "server/request.h"
  13 #include "server.h"
  14
  15
  16 /***********************************************************************
  17  *           CreateEvent32A    (KERNEL32.156)
  18  */
  19 HANDLE WINAPI CreateEventA( SECURITY_ATTRIBUTES *sa, BOOL manual_reset,
  20                                 BOOL initial_state, LPCSTR name )
  21 {
  22     struct create_event_request req;
  23     struct create_event_reply reply;
  24     int len = name ? strlen(name) + 1 : 0;
  25
  26     req.manual_reset = manual_reset;
  27     req.initial_state = initial_state;
  28     req.inherit = (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle);
  29     CLIENT_SendRequest( REQ_CREATE_EVENT, -1, 2, &req, sizeof(req), name, len );
  30     SetLastError(0);
  31     CLIENT_WaitSimpleReply( &reply, sizeof(reply), NULL );
  32     if (reply.handle == -1) return 0;
  33     return reply.handle;
  34 }
  35
  36
  37 /***********************************************************************
  38  *           CreateEvent32W    (KERNEL32.157)
  39  */
  40 HANDLE WINAPI CreateEventW( SECURITY_ATTRIBUTES *sa, BOOL manual_reset,
  41                                 BOOL initial_state, LPCWSTR name )
  42 {
  43     LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
  44     HANDLE ret = CreateEventA( sa, manual_reset, initial_state, nameA );
  45     if (nameA) HeapFree( GetProcessHeap(), 0, nameA );
  46     return ret;
  47 }
  48
  49 /***********************************************************************
  50  *           WIN16_CreateEvent    (KERNEL.457)
  51  */
  52 HANDLE WINAPI WIN16_CreateEvent( BOOL manual_reset, BOOL initial_state )
  53 {
  54     return CreateEventA( NULL, manual_reset, initial_state, NULL );
  55 }
  56
  57
  58 /***********************************************************************
  59  *           OpenEvent32A    (KERNEL32.536)
  60  */
  61 HANDLE WINAPI OpenEventA( DWORD access, BOOL inherit, LPCSTR name )
  62 {
  63     struct open_event_request req;
  64     struct open_event_reply reply;
  65     int len = name ? strlen(name) + 1 : 0;
  66
  67     req.access  = access;
  68     req.inherit = inherit;
  69     CLIENT_SendRequest( REQ_OPEN_EVENT, -1, 2, &req, sizeof(req), name, len );
  70     CLIENT_WaitSimpleReply( &reply, sizeof(reply), NULL );
  71     if (reply.handle == -1) return 0; /* must return 0 on failure, not -1 */
  72     return (HANDLE)reply.handle;
  73 }
  74
  75
  76 /***********************************************************************
  77  *           OpenEvent32W    (KERNEL32.537)
  78  */
  79 HANDLE WINAPI OpenEventW( DWORD access, BOOL inherit, LPCWSTR name )
  80 {
  81     LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
  82     HANDLE ret = OpenEventA( access, inherit, nameA );
  83     if (nameA) HeapFree( GetProcessHeap(), 0, nameA );
  84     return ret;
  85 }
  86
  87
  88 /***********************************************************************
  89  *           EVENT_Operation
  90  *
  91  * Execute an event operation (set,reset,pulse).
  92  */
  93 static BOOL EVENT_Operation( HANDLE handle, enum event_op op )
  94 {
  95     struct event_op_request req;
  96
  97     req.handle = handle;
  98     req.op     = op;
  99     CLIENT_SendRequest( REQ_EVENT_OP, -1, 1, &req, sizeof(req) );
 100     return !CLIENT_WaitReply( NULL, NULL, 0 );
 101 }
 102
 103
 104 /***********************************************************************
 105  *           PulseEvent    (KERNEL32.557)
 106  */
 107 BOOL WINAPI PulseEvent( HANDLE handle )
 108 {
 109     return EVENT_Operation( handle, PULSE_EVENT );
 110 }
 111
 112
 113 /***********************************************************************
 114  *           SetEvent    (KERNEL32.644)
 115  */
 116 BOOL WINAPI SetEvent( HANDLE handle )
 117 {
 118     return EVENT_Operation( handle, SET_EVENT );
 119 }
 120
 121
 122 /***********************************************************************
 123  *           ResetEvent    (KERNEL32.586)
 124  */
 125 BOOL WINAPI ResetEvent( HANDLE handle )
 126 {
 127     return EVENT_Operation( handle, RESET_EVENT );
 128 }
 129
 130
 131 /***********************************************************************
 132  * NOTE: The Win95 VWin32_Event routines given below are really low-level
 133  *       routines implemented directly by VWin32. The user-mode libraries
 134  *       implement Win32 synchronisation routines on top of these low-level
 135  *       primitives. We do it the other way around here :-)
 136  */
 137
 138 /***********************************************************************
 139  *       VWin32_EventCreate     (KERNEL.442)
 140  */
 141 HANDLE WINAPI VWin32_EventCreate(VOID)
 142 {
 143     HANDLE hEvent = CreateEventA( NULL, FALSE, 0, NULL );
 144     return ConvertToGlobalHandle( hEvent );
 145 }
 146
 147 /***********************************************************************
 148  *       VWin32_EventDestroy    (KERNEL.443)
 149  */
 150 VOID WINAPI VWin32_EventDestroy(HANDLE event)
 151 {
 152     CloseHandle( event );
 153 }
 154
 155 /***********************************************************************
 156  *       VWin32_EventWait       (KERNEL.450)
 157  */
 158 VOID WINAPI VWin32_EventWait(HANDLE event)
 159 {
 160     SYSLEVEL_ReleaseWin16Lock();
 161     WaitForSingleObject( event, INFINITE );
 162     SYSLEVEL_RestoreWin16Lock();
 163 }
 164
 165 /***********************************************************************
 166  *       VWin32_EventSet        (KERNEL.451)
 167  */
 168 VOID WINAPI VWin32_EventSet(HANDLE event)
 169 {
 170     SetEvent( event );
 171 }
 172