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Diffstat (limited to '')
| -rw-r--r-- | include/iprt/condvar.h | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/include/iprt/condvar.h b/include/iprt/condvar.h new file mode 100644 index 00000000..3d081945 --- /dev/null +++ b/include/iprt/condvar.h @@ -0,0 +1,287 @@ +/** @file + * IPRT - Condition Variable. + */ + +/* + * Copyright (C) 2006-2019 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE 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. + */ + +#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 */ + |