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Pthread Mutex Init Error

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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn pthread mutex example more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags pthread mutex attributes Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, pthread mutex initializer helping each other. Join them; it only takes a minute: Sign up pthread_mutex_t init error up vote 4 down vote favorite I am using xcode 2.4.1 on tiger. When i do below everything is ok. when i do pthread mutex init example pthread_mutex_t mute; ImageMan() { dibSize=0; mute = PTHREAD_MUTEX_INITIALIZER; } I get these two errors error: expected primary-expression before '{' token error: expected `;' before '{' token I dont know why. However if i do pthread_mutex_t mute = PTHREAD_MUTEX_INITIALIZER; it works fine. Why? -edit- I havent ran it but this seems to compile. Why? huh? pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; mute = mutex; initialization pthreads mutex share|improve this question asked Dec 20 '08 at 13:04 acidzombie24 43k137456818 add

Pthread Mutex Example C++

a comment| 2 Answers 2 active oldest votes up vote 15 down vote accepted PTHREAD_MUTEX_INITIALIZER is a constant initializer, valid when in initialization only. It is a macro that doesn't necessarily expand to an integral type. Your mute=mutex; is invalid- instead you should use: pthread_mutex_init(&mute, NULL); or if you're allocating mutexes dynamically: m = malloc(sizeof(pthread_mutex_t))); pthread_mutex_init(m, NULL); share|improve this answer answered Dec 20 '08 at 13:54 geocar 7,0891730 add a comment| up vote 0 down vote mute = (pthread_mutex_t)PTHREAD_MUTEX_INITIALIZER; This is an another solution for this error. share|improve this answer answered Jul 10 '15 at 6:11 raja ashok 3,726103761 Always try to give some explanation of answer. –serenesat Jul 10 '15 at 19:34 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name Email Post as a guest Name Email discard By posting your answer, you agree to the privacy policy and terms of service. Not the answer you're looking for? Browse other questions tagged initialization pthreads mutex or ask your own question. asked 7 years ago viewed 8817 times active 1 year ago Blog Stack Overflow Podcast #92 - The Guerilla Guide to Interviewing Get the weekly newsletter! In it, you'll get: The week's top questions and answers Important comm

Mutex ConsistentInitialize a Mutex pthread_mutex_init(3THR) Use pthread_mutex_init(3THR) to initialize the mutex pointed at by mp to its default value (mattr is NULL), or to specify https://docs.oracle.com/cd/E19455-01/806-5257/sync-112/index.html mutex attributes that have already been set with pthread_mutexattr_init(). (For Solaris http://www.qnx.com/developers/docs/6.3.0SP3/neutrino/lib_ref/p/pthread_mutex_init.html threads, see "mutex_init(3THR)".) Prototype: int pthread_mutex_init(pthread_mutex_t *mp, const pthread_mutexattr_t *mattr); #include pthread_mutex_t mp = PTHREAD_MUTEX_INITIALIZER; pthread_mutexattr_t mattr; int ret; /* initialize a mutex to its default value */ ret = pthread_mutex_init(&mp, NULL); /* initialize a mutex */ ret = pthread_mutex_init(&mp, &mattr); When the pthread mutex mutex is initialized, it is in an unlocked state. The mutex can be in memory shared between processes or in memory private to a process. Note - The mutex memory must be cleared to zero before initialization. The effect of mattr being NULL is the same as passing the address of a default mutex pthread mutex init attribute object, but without the memory overhead. Statically defined mutexes can be initialized directly to have default attributes with the macro PTHREAD_MUTEX_INITIALIZER. A mutex lock must not be reinitialized or destroyed while other threads might be using it. Program failure will result if either action is not done correctly. If a mutex is reinitialized or destroyed, the application must be sure the mutex is not currently in use. Return Values pthread_mutex_init() returns zero after completing successfully. Any other returned value indicates that an error occurred. When any of the following conditions occurs, the function fails and returns the corresponding value. EBUSY The implementation has detected an attempt to reinitialize the object referenced by mp (a previously initialized, but not yet destroyed mutex). EINVAL The mattr attribute value is invalid. The mutex has not been modified. EFAULT The address for the mutex pointed at by mp is invalid. Previous: Mutual Exclusion Lock AttributesNext: Make Mutex Consistent © 2010, Oracle Corporation and/or its affiliates

Virtualization Wireless Framework Bluetooth Acoustics Apps and Media Tools BSP Directory Services Professional Services Training & Education Consulting & Programs Automotive Services Markets Markets Automotive Industrial Medical Networking & Telecoms Security & Defense Rail Safety Developers Developers Developer community Product documentation BSP directory Reference design + demos Downloads QNX Download Center QNX CAR 2.1 SDK for Apps and Media 1.1 QNX Software Development Platform 6.6 QNX Wireless Framework 1.0 Quickstart development guide System Architecture guide FREE 30 day Evaluation Partners Partners Strategic partners Distributors Medical Support Support Overview Support options Support portal Knowledge base Product documentation Developer community Developer Resources Board support packages Foundry27 projects Forums HomeDeveloper ResourcesDeveloper SupportQNX Developer Support PDF Documents QNX Neutrino RTOS Quickstart Guide System Architecture Guide Standard Support User's Guide Priority Support User's Guide This version of this document is no longer maintained. For the latest documentation, see http://www.qnx.com/developers/docs. pthread_mutex_init() Initialize mutex Synopsis: #include pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; int pthread_mutex_init( pthread_mutex_t* mutex, const pthread_mutexattr_t* attr ); Arguments: mutex A pointer to the pthread_mutex_t object that you want to initialize. attr NULL, or a pointer to a pthread_mutexattr_t object that specifies the attributes that you want to use for the mutex. For more information, see pthread_mutexattr_init(). Library: libc Use the -l c option to qcc to link against this library. This library is usually included automatically. Description: The pthread_mutex_init() functio

 

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