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Forum: C

May 14th, 2008, 8:19 AM

Replies: 3

Where can i get source code of NPTL pthreads for linux 2.6.23 or around?

Views: 325

Posted By mynickmynick

Where can i get source code of NPTL pthreads for linux 2.6.23 or around?

Where can i get source code of NPTL pthreads for linux 2.6.23 or around?

Forum: C

May 8th, 2008, 8:59 AM

Replies: 3

pthread_cond_wait if cancelled leaves mutex locked deadlocking other threads?!

Views: 436

Posted By mynickmynick

Re: pthread_cond_wait if cancelled leaves mutex locked deadlocking other threads?!

So may be to prevent this the correct usage is

pthread_mutex_lock(mutex);
pthread_cleanup_push(pthread_mutex_unlock,mutex);
while (...) pthread_cond_wait(cond,mutex);
......
...

Forum: C

May 8th, 2008, 8:03 AM

Replies: 3

pthread_cond_wait if cancelled leaves mutex locked deadlocking other threads?!

Views: 436

Posted By mynickmynick

pthread_cond_wait if cancelled leaves mutex locked deadlocking other threads?!

From the following source code

int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
{
volatile pthread_descr self = thread_self();

__pthread_lock(&cond->__c_lock,...

Forum: C

May 7th, 2008, 12:27 PM

Replies: 0

nice for pthreads? (linux)

Views: 317

Posted By mynickmynick

nice for pthreads? (linux)

With Linux kernel 2.6
nice() called inside a pthread
affects only the calling thread
or all threads of the process??
(I guess in POSIX it affects the process, but Linux is not fully POSIX compliant...

Forum: C

May 7th, 2008, 9:39 AM

Replies: 0

sem_wait()/post() Vs. pthread_cond_wait()/broadcast()

Views: 291

Posted By mynickmynick

sem_wait()/post() Vs. pthread_cond_wait()/broadcast()

What are advantages/disadvantages of using

sem_wait() and sem_post() instead of
pthread_cond_wait() and pthread_cond_broadcast()

for sincronizing pthreads?

I guess but please correct...

Forum: C

May 5th, 2008, 9:13 AM

Replies: 1

pthread safe library functions?

Views: 209

Posted By mynickmynick

pthread safe library functions?

In linux using pthreads
When I call a whatever usual function like for instance:

thread 1
a=div(b,c).rem //a = div remainder of b div c

thread 2
x=div(y,z).rem

so I call the same function on...

Forum: C

May 5th, 2008, 8:29 AM

Replies: 1

sig_atomic_t to avoid mutex/critical sections

Views: 196

Posted By mynickmynick

sig_atomic_t to avoid mutex/critical sections

On linux using pthreads, if I have a 2-bytes variable x shared by pthreads used only in the following ways:
(1)
x=value;
(2) or (separately)
if (x==value) {do something (not with x)}
(3) or...

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