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Pthread_mutex_init Error Handling

const pthread_mutexattr_t *attr); int pthread_mutex_destroy(pthread_mutex_t *mutex); pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; DESCRIPTION The pthread_mutex_init() function initialises the mutex referenced by mutex

Pthread_mutex_init Example

with attributes specified by attr. If attr is NULL, the pthread_mutex_init c default mutex attributes are used; the effect is the same as passing the address pthread_mutex_init attributes of a default mutex attributes object. Upon successful initialisation, the state of the mutex becomes initialised and unlocked. Attempting to initialise an already initialised

Pthread_mutex_initializer Vs Pthread_mutex_init

mutex results in undefined behaviour. The pthread_mutex_destroy() function destroys the mutex object referenced by mutex; the mutex object becomes, in effect, uninitialised. An implementation may cause pthread_mutex_destroy() to set the object referenced by mutex to an invalid value. A destroyed mutex object can be re-initialised using pthread_mutex_init(); the results

Pthread_mutex_init Man

of otherwise referencing the object after it has been destroyed are undefined. It is safe to destroy an initialised mutex that is unlocked. Attempting to destroy a locked mutex results in undefined behaviour. In cases where default mutex attributes are appropriate, the macro PTHREAD_MUTEX_INITIALIZER can be used to initialise mutexes that are statically allocated. The effect is equivalent to dynamic initialisation by a call to pthread_mutex_init() with parameter attr specified as NULL, except that no error checks are performed. RETURN VALUE If successful, the pthread_mutex_init() and pthread_mutex_destroy() functions return zero. Otherwise, an error number is returned to indicate the error. The [EBUSY] and [EINVAL] error checks, if implemented, act as if they were performed immediately at the beginning of processing for the function and cause an error return prior to modifying the state of the mutex specified by mutex. ERRORS The pthread_mutex_init() f

here for a quick overview of the site Help Center Detailed answers to any questions http://stackoverflow.com/questions/383293/pthread-mutex-t-init-error you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a pthread_mutex_init error community of 6.2 million programmers, just like you, 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_t mute; ImageMan() { dibSize=0; mute = pthread_mutex_init error handling 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 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

 

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