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Top Forums Programming How to sleep and wake a thread??? Post 302582627 by DreamWarrior on Friday 16th of December 2011 02:59:14 PM
Old 12-16-2011
Quote:
Originally Posted by jim mcnamara
As John said above, you probably want your thread to block not sleep. Calls like sleep send SIGALRM to the calling process, not just the thread. This means that you have to set up signal handling for the thread in question, and have all the other threads ignore
SIGALRM (example only, there are other signals)

Using a condition wait or a mutex wait is much more efficient.
sleep doesn't send SIGALRM.

At any rate, pause will work, I've seen people do:

Code:
for ( ; ; ) sleep(UINT_MAX);

And then, as mentioned, pthread_kill can wake it provided the thread hasn't blocked the signal.

Also, as mentioned, there is no way for another thread to cause someone to "go to sleep".

For your edification, this seems like a simple producer-consumer model, and that's usually handled with condition variables. See: pthread_cond_init, pthread_cond_wait, and pthread_cond_signal.
 

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sleep(1)							   User Commands							  sleep(1)

NAME
sleep - suspend execution for an interval SYNOPSIS
sleep time DESCRIPTION
The sleep utility will suspend execution for at least the integral number of seconds specified by the time operand. OPERANDS
The following operands are supported: time A non-negative decimal integer specifying the number of seconds for which to suspend execution. EXAMPLES
Example 1: Suspending command execution for a time To execute a command after a certain amount of time: example% (sleep 105; command)& Example 2: Executing a command every so often example% while true do command sleep 37 done ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of sleep: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. EXIT STATUS
The following exit values are returned: 0 The execution was successfully suspended for at least time seconds, or a SIGALRM signal was received (see NOTES). >0 An error has occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
wait(1), alarm(2), sleep(3C), wait(3UCB), attributes(5), environ(5), standards(5) NOTES
If the sleep utility receives a SIGALRM signal, one of the following actions will be taken: o Terminate normally with a zero exit status. o Effectively ignore the signal. The sleep utility will take the standard action for all other signals. SunOS 5.10 1 Feb 1995 sleep(1)
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