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/** @file
* IPRT - Condition Variable.
*/
/*
* Copyright (C) 2006-2025 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#ifndef IPRT_INCLUDED_condvar_h
#define IPRT_INCLUDED_condvar_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <iprt/cdefs.h>
#include <iprt/types.h>
#if defined(RT_LOCK_STRICT_ORDER) && defined(IN_RING3)
# include <iprt/lockvalidator.h>
#endif
RT_C_DECLS_BEGIN
/** @defgroup grp_rt_condvar RTCondVar - Condition Variable
*
* Condition variables combines mutex semaphore or critical sections with event
* semaphores. See @ref grp_rt_sems_mutex, @ref grp_rt_critsect,
* @ref grp_rt_sems_event and @ref grp_rt_sems_event_multi.
*
* @ingroup grp_rt
* @{
*/
/**
* Create a condition variable.
*
* @returns iprt status code.
* @param phCondVar Where to store the handle to the newly created
* condition variable.
*/
RTDECL(int) RTCondVarCreate(PRTCONDVAR phCondVar);
/**
* Create a condition variable.
*
* @returns iprt status code.
* @param phCondVar Where to store the handle to the newly created
* condition variable.
* @param fFlags Flags, any combination of the
* RTCONDVAR_FLAGS_XXX \#defines.
* @param hClass The class (no reference consumed). Since we
* don't do order checks on condition variables,
* the use of the class is limited to controlling
* the timeout threshold for deadlock detection.
* @param pszNameFmt Name format string for the lock validator,
* optional (NULL). Max length is 32 bytes.
* @param ... Format string arguments.
*/
RTDECL(int) RTCondVarCreateEx(PRTCONDVAR phCondVar, uint32_t fFlags, RTLOCKVALCLASS hClass,
const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR(4, 5);
/** @name RTCondVarCreateEx flags
* @{ */
/** Disables lock validation. */
#define RTCONDVAR_FLAGS_NO_LOCK_VAL UINT32_C(0x00000001)
/** @} */
/**
* Destroy a condition variable.
*
* @returns iprt status code.
* @param hCondVar Handle of the condition variable. NIL_RTCONDVAR
* is quietly ignored (VINF_SUCCESS).
*/
RTDECL(int) RTCondVarDestroy(RTCONDVAR hCondVar);
/**
* Signal the condition variable, waking up exactly one thread.
*
* It is recommended that the caller holds the associated lock, but this is not
* strictly speaking necessary.
*
* If no threads are waiting on the condition variable, the call will have no
* effect on the variable.
*
* @returns iprt status code.
* @param hCondVar The condition variable to signal.
*/
RTDECL(int) RTCondVarSignal(RTCONDVAR hCondVar);
/**
* Signal the condition variable, waking up all blocked threads.
*
* It is recommended that the caller holds the associated lock, but this is not
* strictly speaking necessary.
*
* If no threads are waiting on the condition variable, the call will have no
* effect on the variable.
*
* @returns iprt status code.
* @param hCondVar The condition variable to broadcast.
*/
RTDECL(int) RTCondVarBroadcast(RTCONDVAR hCondVar);
/**
* Wait for the condition variable to be signaled, resume on interruption.
*
* This function will resume if the wait is interrupted by an async system event
* (like a unix signal) or similar.
*
* @returns iprt status code.
* Will not return VERR_INTERRUPTED.
* @param hCondVar The condition variable to wait on.
* @param hMtx The mutex to leave during the wait and which
* will be re-enter before returning.
* @param cMillies Number of milliseconds to wait. Use
* RT_INDEFINITE_WAIT to wait forever.
*/
RTDECL(int) RTCondVarMutexWait(RTCONDVAR hCondVar, RTSEMMUTEX hMtx, RTMSINTERVAL cMillies);
/**
* Wait for the condition variable to be signaled, return on interruption.
*
* This function will not resume the wait if interrupted.
*
* @returns iprt status code.
* @param hCondVar The condition variable to wait on.
* @param hMtx The mutex to leave during the wait and which
* will be re-enter before returning.
* @param cMillies Number of milliseconds to wait. Use
* RT_INDEFINITE_WAIT to wait forever.
*/
RTDECL(int) RTCondVarMutexWaitNoResume(RTCONDVAR hCondVar, RTSEMMUTEX hMtx, RTMSINTERVAL cMillies);
/**
* Wait for the condition variable to be signaled, resume on interruption.
*
* This function will resume if the wait is interrupted by an async system event
* (like a unix signal) or similar.
*
* @returns iprt status code.
* Will not return VERR_INTERRUPTED.
* @param hCondVar The condition variable to wait on.
* @param hRWSem The read/write semaphore to write-leave during
* the wait and which will be re-enter in write
* mode before returning.
* @param cMillies Number of milliseconds to wait. Use
* RT_INDEFINITE_WAIT to wait forever.
*/
RTDECL(int) RTCondVarRWWriteWait(RTCONDVAR hCondVar, RTSEMRW hRWSem, RTMSINTERVAL cMillies);
/**
* Wait for the condition variable to be signaled, return on interruption.
*
* This function will not resume the wait if interrupted.
*
* @returns iprt status code.
* @param hCondVar The condition variable to wait on.
* @param hRWSem The read/write semaphore to write-leave during
* the wait and which will be re-enter in write
* mode before returning.
* @param cMillies Number of milliseconds to wait. Use
* RT_INDEFINITE_WAIT to wait forever.
*/
RTDECL(int) RTCondVarRWWriteWaitNoResume(RTCONDVAR hCondVar, RTSEMRW hRWSem, RTMSINTERVAL cMillies);
/**
* Wait for the condition variable to be signaled, resume on interruption.
*
* This function will resume if the wait is interrupted by an async system event
* (like a unix signal) or similar.
*
* @returns iprt status code.
* Will not return VERR_INTERRUPTED.
* @param hCondVar The condition variable to wait on.
* @param hRWSem The read/write semaphore to read-leave during
* the wait and which will be re-enter in read mode
* before returning.
* @param cMillies Number of milliseconds to wait. Use
* RT_INDEFINITE_WAIT to wait forever.
*/
RTDECL(int) RTCondVarRWReadWait(RTCONDVAR hCondVar, RTSEMRW hRWSem, RTMSINTERVAL cMillies);
/**
* Wait for the condition variable to be signaled, return on interruption.
*
* This function will not resume the wait if interrupted.
*
* @returns iprt status code.
* @param hCondVar The condition variable to wait on.
* @param hRWSem The read/write semaphore to read-leave during
* the wait and which will be re-enter in read mode
* before returning.
* @param cMillies Number of milliseconds to wait. Use
* RT_INDEFINITE_WAIT to wait forever.
*/
RTDECL(int) RTCondVarRWReadWaitNoResume(RTCONDVAR hCondVar, RTSEMRW hRWSem, RTMSINTERVAL cMillies);
/**
* Wait for the condition variable to be signaled, resume on interruption.
*
* This function will resume if the wait is interrupted by an async system event
* (like a unix signal) or similar.
*
* @returns iprt status code.
* Will not return VERR_INTERRUPTED.
* @param hCondVar The condition variable to wait on.
* @param pCritSect The critical section to leave during the wait
* and which will be re-enter before returning.
* @param cMillies Number of milliseconds to wait. Use
* RT_INDEFINITE_WAIT to wait forever.
*/
RTDECL(int) RTCondVarCritSectWait(RTCONDVAR hCondVar, PRTCRITSECT pCritSect, RTMSINTERVAL cMillies);
/**
* Wait for the condition variable to be signaled, return on interruption.
*
* This function will not resume the wait if interrupted.
*
* @returns iprt status code.
* @param hCondVar The condition variable to wait on.
* @param pCritSect The critical section to leave during the wait
* and which will be re-enter before returning.
* @param cMillies Number of milliseconds to wait. Use
* RT_INDEFINITE_WAIT to wait forever.
*/
RTDECL(int) RTCondVarCritSectWaitNoResume(RTCONDVAR hCondVar, PRTCRITSECT pCritSect, RTMSINTERVAL cMillies);
/**
* Sets the signaller thread to one specific thread.
*
* This is only used for validating usage and deadlock detection. When used
* after calls to RTCondVarAddSignaller, the specified thread will be the only
* signalling thread.
*
* @param hCondVar The condition variable.
* @param hThread The thread that will signal it. Pass
* NIL_RTTHREAD to indicate that there is no
* special signalling thread.
*/
RTDECL(void) RTCondVarSetSignaller(RTCONDVAR hCondVar, RTTHREAD hThread);
/**
* To add more signalling threads.
*
* First call RTCondVarSetSignaller then add further threads with this.
*
* @param hCondVar The condition variable.
* @param hThread The thread that will signal it. NIL_RTTHREAD is
* not accepted.
*/
RTDECL(void) RTCondVarAddSignaller(RTCONDVAR hCondVar, RTTHREAD hThread);
/**
* To remove a signalling thread.
*
* Reverts work done by RTCondVarAddSignaller and RTCondVarSetSignaller.
*
* @param hCondVar The condition variable.
* @param hThread A previously added thread.
*/
RTDECL(void) RTCondVarRemoveSignaller(RTCONDVAR hCondVar, RTTHREAD hThread);
/** @} */
RT_C_DECLS_END
#endif /* !IPRT_INCLUDED_condvar_h */
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