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58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/*
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* PROJECT: ReactOS
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* LICENSE: GPL - See COPYING in the top level directory
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* FILE: base/services/audiosrv/pnp_list_lock.c
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* PURPOSE: Audio Service Plug and Play list locking mechanism
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* COPYRIGHT: Copyright 2007 Andrew Greenwood
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*/
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#include "audiosrv.h"
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#include <assert.h>
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static HANDLE audio_device_list_lock = NULL;
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BOOL
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InitializeAudioDeviceListLock(VOID)
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{
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/* The security stuff is to make sure the mutex can be grabbed by
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other processes - is this the best idea though ??? */
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SECURITY_DESCRIPTOR security_descriptor;
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SECURITY_ATTRIBUTES security;
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InitializeSecurityDescriptor(&security_descriptor, SECURITY_DESCRIPTOR_REVISION);
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SetSecurityDescriptorDacl(&security_descriptor, TRUE, 0, FALSE);
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security.nLength = sizeof(SECURITY_ATTRIBUTES);
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security.lpSecurityDescriptor = &security_descriptor;
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security.bInheritHandle = FALSE;
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audio_device_list_lock = CreateMutex(&security,
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FALSE,
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AUDIO_LIST_LOCK_NAME);
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return (audio_device_list_lock != NULL);
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}
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VOID
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KillAudioDeviceListLock(VOID)
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{
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CloseHandle(audio_device_list_lock);
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audio_device_list_lock = NULL;
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}
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VOID
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LockAudioDeviceList(VOID)
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{
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assert(audio_device_list_lock != NULL);
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WaitForSingleObject(audio_device_list_lock, INFINITE);
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}
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VOID
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UnlockAudioDeviceList(VOID)
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{
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assert(audio_device_list_lock != NULL);
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ReleaseMutex(audio_device_list_lock);
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}
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