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Pthread_mutex_lock Error Handling

pthread_mutex_lock(pthread_mutex_t *mutex); int pthread_mutex_trylock(pthread_mutex_t *mutex); int pthread_mutex_unlock(pthread_mutex_t *mutex); DESCRIPTION The mutex object referenced by mutex is locked by calling pthread_mutex_lock(). If the mutex is already locked, the calling thread blocks until the mutex

Pthread_mutex_lock Example

becomes available. This operation returns with the mutex object referenced by mutex pthread_mutex_lock return value in the locked state with the calling thread as its owner. If the mutex type is PTHREAD_MUTEX_NORMAL, deadlock what is pthread_mutex_lock detection is not provided. Attempting to relock the mutex causes deadlock. If a thread attempts to unlock a mutex that it has not locked or a mutex which is unlocked,

Man Pthread_mutex_lock

undefined behaviour results. If the mutex type is PTHREAD_MUTEX_ERRORCHECK, then error checking is provided. If a thread attempts to relock a mutex that it has already locked, an error will be returned. If a thread attempts to unlock a mutex that it has not locked or a mutex which is unlocked, an error will be returned. If the mutex type

Pthread_mutex_init

is PTHREAD_MUTEX_RECURSIVE, then the mutex maintains the concept of a lock count. When a thread successfully acquires a mutex for the first time, the lock count is set to one. Every time a thread relocks this mutex, the lock count is incremented by one. Each time the thread unlocks the mutex, the lock count is decremented by one. When the lock count reaches zero, the mutex becomes available for other threads to acquire. If a thread attempts to unlock a mutex that it has not locked or a mutex which is unlocked, an error will be returned. If the mutex type is PTHREAD_MUTEX_DEFAULT, attempting to recursively lock the mutex results in undefined behaviour. Attempting to unlock the mutex if it was not locked by the calling thread results in undefined behaviour. Attempting to unlock the mutex if it is not locked results in undefined behaviour. The function pthread_mutex_trylock() is identical to pthread_mutex_lock() except that if the mutex object referenced by mutex is currently locked (by any thread, including the current thread), the call returns immediately. The pthread_mutex_unlock() function rel

and unlock a mutex SYNOPSIS #include <pthread.h>

int pthread_mutex_lock(pthread_mutex_t *
mutex);
int pthread_mutex_trylock(pthread_mutex_t *
mutex);
int pthread_mutex_unlock(pthread_mutex_t *
mutex);
DESCRIPTION The mutex object referenced by mutex shall be pthread_mutex_unlock locked by a call to pthread_mutex_lock() that returns zero or [EOWNERDEAD]. If

Pthread_mutex_lock Timeout

the mutex is already locked by another thread, the calling thread shall block until the mutex becomes available. pthread_mutex_trylock This operation shall return with the mutex object referenced by mutex in the locked state with the calling thread as its owner. If a thread attempts to relock a http://pubs.opengroup.org/onlinepubs/7908799/xsh/pthread_mutex_lock.html mutex that it has already locked, pthread_mutex_lock() shall behave as described in the Relock column of the following table. If a thread attempts to unlock a mutex that it has not locked or a mutex which is unlocked, pthread_mutex_unlock() shall behave as described in the Unlock When Not Owner column of the following table. Mutex Type Robustness Relock Unlock http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_mutex_lock.html When Not Owner NORMAL non-robust deadlock undefined behavior NORMAL robust deadlock error returned ERRORCHECK either error returned error returned RECURSIVE either recursive error returned (see below) DEFAULT non-robust undefined undefined behavior behavior DEFAULT robust undefined error returned behavior If the mutex type is PTHREAD_MUTEX_DEFAULT, the behavior of pthread_mutex_lock() may correspond to one of the three other standard mutex types as described in the table above. If it does not correspond to one of those three, the behavior is undefined for the cases marked . Where the table indicates recursive behavior, the mutex shall maintain the concept of a lock count. When a thread successfully acquires a mutex for the first time, the lock count shall be set to one. Every time a thread relocks this mutex, the lock count shall be incremented by one. Each time the thread unlocks the mutex, the lock count shall be decremented by one. When the lock count reaches zero, the mutex shall become available for other threads to acquire. The pthread_mutex_trylock()

a Question Ask for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get Help Ask a Question Ask for Help Receive Real-Time Help Create a Freelance Project Hire https://www.experts-exchange.com/questions/27656713/handling-pthread-mutex-lock-pthread-mutex-unlock-errors.html for a Full Time Job Ways to Get Help Expand Search Submit Close Search Login Join Today Products BackProducts Gigs Live Courses Vendor Services Groups Careers Store Headlines Website Testing Experts Exchange > Questions > handling pthread_mutex_lock, pthread_mutex_unlock errors Want to Advertise Here? Solved handling pthread_mutex_lock, pthread_mutex_unlock errors Posted on 2012-03-30 C C++ Linux 1 Verified Solution 1 Comment 533 Views Last Modified: pthread_mutex_lock error 2012-03-31 Hi Experts, Assuming I have the following code for creating a singleton, how can I handle if error is returned from pthread functions? What is a good way to handle it. Manager * Manager::getInstance() { if (_instance == 0) { pthread_mutex_lock(&_instanceMutex); if (_instance == 0) // double checked { _instance = new Manager(); } pthread_mutex_unlock(&_instanceMutex); pthread_mutex_lock error handling } return _instance; } Select all Open in new window If I have a setter function like below, what could be the better way to handle pthread errors. void DataHolder::setSomething(int data) { pthread_mutex_lock(&m_dataMutex); m_data = data; pthread_mutex_unlock(&m_dataMutex); } Select all Open in new window 0 Question by:ambuli Facebook Twitter LinkedIn Google LVL 53 Best Solution byInfinity08 >> What is a good way to handle it. Drastically reduce the chance errors might be returned by : 1) ensuring that the mutex is properly initialized before trying to use it. 2) being careful with Go to Solution 1 Comment LVL 53 Overall: Level 53 C++ 36 C 35 Linux 6 Message Accepted Solution by:Infinity082012-03-31 >> What is a good way to handle it. Drastically reduce the chance errors might be returned by : 1) ensuring that the mutex is properly initialized before trying to use it. 2) being careful with recursive locking (your current code doesn't show that, unless the Manager constructor calls Manager::getInstance, or the same mutex is used outside of Manager::getInstance, for different purposes eg. -- don't do either of this). 3) ensuring there

 

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pthread_mutex_lock error numbers

Pthread mutex lock Error Numbers p - lock and unlock a mutex SYNOPSIS tt sup a href javascript open code 'THR' THR a sup img src images opt-start gif alt Option Start border include a href basedefs pthread h html pthread h a br br int pthread mutex lock pthread mutex t tt i mutex i tt br int pthread mutex trylock pthread mutex t tt i mutex i tt br int pthread mutex unlock pthread mutex t tt i mutex i tt img src images opt-end gif Pthread mutex lock Example alt Option End border tt DESCRIPTION The mutex

pthread_mutex_lock error 35

Pthread mutex lock Error p p p p p p p p

pthread_mutex_lock error codes

Pthread mutex lock Error Codes p pthread mutex lock pthread mutex t i mutex i int pthread mutex trylock pthread mutex t i mutex i int pthread mutex unlock pthread mutex t i mutex i DESCRIPTION The mutex object referenced by mutex is locked by calling pthread mutex lock If the mutex is already locked the calling thread blocks until the mutex becomes available Pthread mutex lock Example This operation returns with the mutex object referenced by mutex in the pthread mutex lock return value locked state with the calling thread as its owner If the mutex type is PTHREAD

pthread_mutex_lock error code 22

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pthread_mutex_lock error checking

Pthread mutex lock Error Checking p pthread mutex lock pthread mutex t i mutex i int pthread mutex trylock pthread mutex t i mutex i int pthread mutex unlock pthread mutex t i mutex i DESCRIPTION The mutex object referenced by mutex is locked by calling pthread mutex lock If the mutex is already locked the calling Pthread mutex lock Example thread blocks until the mutex becomes available This operation returns with pthread mutex lock return value the mutex object referenced by mutex in the locked state with the calling thread as its Man Pthread mutex lock owner If the