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153 lines
4.0 KiB
153 lines
4.0 KiB
/*
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*
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* NOTES:
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*
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* REVISIONS:
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* jwa 09FEB92 creation
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* pcy21Apr93: OS2 FE merge
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* pcy08Apr94: Trim size, use static iterators, dead code removal
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* srt21Jun96: Added named shared event type semaphores
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* mwh27Jan97: add this pointer to semaphore name in default ctor, needed
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* to help with semaphores being used in a DLL and a client
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* to a DLL. The DLL and the client each get their own copy
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* of SemKey, but the memory addresses will be unique
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*/
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#include "cdefine.h"
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#if (C_OS & C_NT)
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#include <windows.h>
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#include <stdio.h>
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#endif
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#include "err.h"
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#include "apcsemnt.h"
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INT SemKey = 0;
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//-------------------------------------------------------------------------
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// The semaphore is created as unnamed and shared
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//
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ApcSemaphore::ApcSemaphore(VOID) :
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Semaphore()
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{
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SetObjectStatus(ErrNO_ERROR);
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// unnamed semaphore, shared and
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TCHAR cBuffer[128];
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// add use of this pointer in the name - the memory address will be
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// unique throughout this process, including any DLL's that are mapped
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// in. This ocurred because if a DLL uses ApcSemaphore, and a client
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// of the DLL also uses ApcSemaphore they each have their own copy of
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// SemKey, meaning it is possible, and likely that when the DLL makes
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// use of this CTOR, and the client makes use of this CTOR that they
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// will map to the same name, therefore you will get two ApcSemaphore
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// objects that both reference the same event. By adding the this
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// pointer each event should be unique
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_stprintf(
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cBuffer,
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_TEXT("%ld%ld_%d_%ld"),
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GetCurrentProcessId(),
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GetCurrentThreadId(),
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SemKey,
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(INT_PTR)this);
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SemKey++;
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SemHand=CreateEvent((LPSECURITY_ATTRIBUTES)NULL,
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TRUE, // Manual Reset
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FALSE, // Initial State
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cBuffer);
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if(!SemHand){
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SetObjectStatus(ErrSEM_CREATE_FAILED);
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}
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}
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//-------------------------------------------------------------------------
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//
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ApcSemaphore::ApcSemaphore(TCHAR * cBuffer) //named shared event
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{
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SemHand=CreateEvent((LPSECURITY_ATTRIBUTES)NULL,
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FALSE, // Manual Reset
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FALSE, // Initial State
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cBuffer);
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if(!SemHand){
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SetObjectStatus(ErrSEM_CREATE_FAILED);
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}
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}
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//-------------------------------------------------------------------------
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//
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ApcSemaphore::~ApcSemaphore()
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{
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CloseHandle(SemHand);
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}
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//-------------------------------------------------------------------------
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//
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INT ApcSemaphore::Post(VOID)
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{
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INT err = ErrNO_ERROR;
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if(!SetEvent(SemHand))
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err= ErrSEM_GENERAL_ERROR;
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return err;
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}
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//-------------------------------------------------------------------------
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//
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INT ApcSemaphore::Clear(VOID)
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{
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INT err = ErrNO_ERROR;
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if(!ResetEvent(SemHand))
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err = ErrSEM_GENERAL_ERROR;
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return err;
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}
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//-------------------------------------------------------------------------
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//
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INT ApcSemaphore::IsPosted(VOID)
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{
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// Could also call TimedWait(0)
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//
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INT ret = ErrSEM_BLOCK_NG;
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DWORD waitresult = WaitForSingleObject(SemHand,(DWORD)0);
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if(waitresult == WAIT_TIMEOUT)
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ret = ErrNO_ERROR;
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return ret;
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}
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//-------------------------------------------------------------------------
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// Wait for sem to be posted
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//
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// ulTimeout: 0 - Don't wait at all
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// <0 - Wait forever (same as Wait())
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// >0 - Wait for ulTimeout milliseconds
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//
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INT ApcSemaphore::TimedWait(LONG ulTimeout)
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{
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INT err;
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DWORD time_out = (ulTimeout < 0) ? INFINITE : ulTimeout;
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DWORD waitresult=WaitForSingleObject(SemHand,time_out);
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if(waitresult == 0){
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err = ErrNO_ERROR;
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}
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else if (waitresult == WAIT_TIMEOUT) {
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err = ErrSEM_TIMED_OUT;
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}
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else {
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err = ErrSEM_GENERAL_ERROR;
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}
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return err;
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}
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