PTHREAD_COND_BROADCAST(3) BSD Library Functions Manual PTHREAD_COND_BROADCAST(3)NAME
pthread_cond_broadcast -- unblock all threads waiting for a condition variable
SYNOPSIS
#include <pthread.h>
int
pthread_cond_broadcast(pthread_cond_t *cond);
DESCRIPTION
The pthread_cond_broadcast() function unblocks all threads that are waiting for the condition variable cond.
RETURN VALUES
If successful, the pthread_cond_broadcast() function will return zero. Otherwise, an error number will be returned to indicate the error.
ERRORS
pthread_cond_broadcast() will fail if:
[EINVAL] The value specified by cond is invalid.
SEE ALSO pthread_cond_destroy(3), pthread_cond_init(3), pthread_cond_signal(3), pthread_cond_timedwait(3), pthread_cond_wait(3)STANDARDS
pthread_cond_broadcast() conforms to ISO/IEC 9945-1:1996 (``POSIX.1'').
BSD July 28, 1998 BSD
Check Out this Related Man Page
pthread_cond_signal(3C)pthread_cond_signal(3C)NAME
pthread_cond_signal, pthread_cond_broadcast - signal or broadcast a condition
SYNOPSIS
cc -mt [ flag... ] file... -lpthread [ library... ]
#include <pthread.h>
int pthread_cond_signal(pthread_cond_t *cond);
int pthread_cond_broadcast(pthread_cond_t *cond);
These two functions are used to unblock threads blocked on a condition variable.
The pthread_cond_signal() call unblocks at least one of the threads that are blocked on the specified condition variable cond (if any
threads are blocked on cond).
The pthread_cond_broadcast() call unblocks all threads currently blocked on the specified condition variable cond.
If more than one thread is blocked on a condition variable, the scheduling policy determines the order in which threads are unblocked. When
each thread unblocked as a result of a pthread_cond_signal() or pthread_cond_broadcast() returns from its call to pthread_cond_wait() or
pthread_cond_timedwait(), the thread owns the mutex with which it called pthread_cond_wait() or pthread_cond_timedwait(). The thread(s)
that are unblocked contend for the mutex according to the scheduling policy (if applicable), and as if each had called
pthread_mutex_lock().
The pthread_cond_signal() or pthread_cond_broadcast() functions may be called by a thread whether or not it currently owns the mutex that
threads calling pthread_cond_wait() or pthread_cond_timedwait() have associated with the condition variable during their waits; however, if
predictable scheduling behavior is required, then that mutex is locked by the thread calling pthread_cond_signal() or pthread_cond_broad-
cast().
The pthread_cond_signal() and pthread_cond_broadcast() functions have no effect if there are no threads currently blocked on cond.
If successful, the pthread_cond_signal() and pthread_cond_broadcast() functions return 0. Otherwise, an error number is returned to indi-
cate the error.
The pthread_cond_signal() and pthread_cond_broadcast() function may fail if:
EINVAL The value cond does not refer to an initialized condition variable.
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
pthread_cond_init(3C), pthread_cond_wait(3C), pthread_cond_timedwait(3C), attributes(5), condition(5), standards(5)
23 Mar 2005 pthread_cond_signal(3C)
Is it possible that the function "pthread_cond_broadcast" block itself and the function "pthread_cond_wait" unblock in multi-threads programming ? The operating system is AIX 5.2, its maintenance level is : 5.2.0.4, VisualAge C++ 6.0.
Thanks (0 Replies)
As part of a multi-threaded code that I am designing, I am using mutexes to control access to a shared data segments in the code. I have no problems initalising and manipulating the mutexes to control access, however terminating the mutex itself is proving to be a bit difficult.
I am... (3 Replies)
Could any one please suggest me how to solve this......
when I compiled the program and tried to execute it as follows, it works fine under different inputs like:
./main -r 300 -w 3 -s 100
./main -r 600 -w 3 -s 1000
./main -r 10 -w 3 -s 100
But it fails when I tired to give the input as... (1 Reply)
can any one give me an example of a concurrency program in threads and signals, i.e how to deliver messages between threads using signals. thanks (2 Replies)
I am attempting to write a program with multiple POSIX threads. I want to ensure all threads are released at the same time. I am (trying to) use a semaphore to accomplish this.
Without too much irrelevant information, I declare my semaphore with 0 of 25 resources available. Is there a way... (7 Replies)
I have problem that if I create for example 100 threads program work correctly but if I define more threads for example 1000
// if I change static int NUM_E from 100 to 1000
than program stop about 350 threads and doesn't continue
where should be problem please?
#include <pthread.h>... (4 Replies)