tis_cond_signal(3) Library Functions Manual tis_cond_signal(3)NAME
tis_cond_signal - Wakes at least one thread that is waiting on the specified condition variable.
LIBRARY
Standard C Library (libc.so, libc.a)
SYNOPSIS
#include <tis.h>
int tis_cond_signal(
pthread_cond_t *cond);
STANDARDS
None
PARAMETERS
Address of the condition variable (passed by reference) on which to signal.
DESCRIPTION
When threads are present, this routine unblocks at least one thread that is waiting on the specified condition variable cond. When threads
are not present, this routine has no effect.
For more information about actions taken when threads are present, refer to the pthread_cond_signal(3) description.
RETURN VALUES
If an error condition occurs, this routine returns an integer value indicating the type of error. Possible return values are as follows:
Successful completion. The value specified by cond is not a valid condition variable.
ERRORS
None
RELATED INFORMATION
Functions: tis_cond_broadcast(3), tis_cond_destroy(3), tis_cond_init(3), tis_cond_wait(3)
Manuals: Guide to DECthreads and Programmer's Guide
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tis_cond_signal(3)
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tis_cond_timedwait(3) Library Functions Manual tis_cond_timedwait(3)NAME
tis_cond_timedwait - Causes a thread to wait for the specified condition variable to be signaled or broadcast, such that it will awake
after a specified period of time.
LIBRARY
Standard C Library (libc.so, libc.a)
SYNOPSIS
#include <tis.h>
int tis_cond_timedwait(
pthread_cond_t *cond,
pthread_mutex_t *mutex,
const struct timespec *abstime);
STANDARDS
None
PARAMETERS
Condition variable that the calling thread waits on. Mutex associated with the condition variable specified in cond. Absolute time at
which the wait expires, if the condition has not been signaled or broadcast. See the tis_get_expiration(3) routine, which is used to obtain
a value for this argument.
The abstime argument is specified in Universal Coordinated Time (UTC). In the UTC-based model, time is represented as seconds since the
Epoch. The Epoch is defined as the time 0 hours, 0 minutes, 0 seconds, January 1st, 1970 UTC. Seconds since the Epoch is a value inter-
preted as the number of seconds between a specified time and the Epoch.
DESCRIPTION
If threads are not present, this function is equivalent to sleep(3).
This routine causes a thread to wait until one of the following occurs: The specified condition variable is signaled or broadcast. The
current system clock time is greater than or equal to the time specified by the abstime argument.
This routine is identical to tis_cond_wait(3), except that this routine can return before a condition variable is signaled or broadcast;
specifically, when the specified time expires. For more information, see the tis_cond_wait(3) description.
This routine automatically releases the mutex and causes the calling thread to wait on the condition. When the thread regains control after
calling tis_cond_timedwait(3), the mutex is locked and the thread is the owner. This is true regardless of why the wait ended. If general
cancelability is enabled, the thread requires the mutex (blocking if necessary) before the cleanup handlers are run (or before the excep-
tion is raised).
If the current time equals or exceeds the expiration time, this routine returns immediately, releasing and reacquiring the mutex. It might
cause the calling thread to yield (see the sched_yield(3) description). Your code should check the return status whenever this routine
returns and take the appropriate action. Otherwise, waiting on the condition variable can become a nonblocking loop.
Call this routine after you have locked the mutex specified in mutex. The results of this routine are unpredictable if this routine is
called without first locking the mutex. The only routines which are supported for use with asynchronous cancelability enabled are those
which disable asynchronous cancelability.
RETURN VALUES
If an error condition occurs, this routine returns an integer value indicating the type of error. Possible return values are as follows:
Successful completion. The value specified by cond, mutex, or abstime is invalid, or: Different mutexes are supplied for concurrent
tis_cond_timedwait(3) or tis_cond_wait(3) operations on the same condition variable, or: The mutex was not owned by the calling thread at
the time of the call. DECthreads cannot acquire memory needed to block using a statically initialized condition variable. The time speci-
fied by abstime expired.
ERRORS
None
RELATED INFORMATION
Functions: tis_cond_broadcast(3), tis_cond_destroy(3), tis_cond_init(3), tis_cond_signal(3), tis_cond_wait(3), tis_get_expiration(3)
Manuals: Guide to DECthreads and Programmer's Guide
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tis_cond_timedwait(3)