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Full Discussion: Threading...
Top Forums UNIX for Dummies Questions & Answers Threading... Post 302088574 by ianlow on Wednesday 13th of September 2006 09:32:32 AM
Old 09-13-2006
Threading...

Sorry, i may be posting the wrong question in this forum... but just curious, suppose we have a set of pre-emptively scheduled processes. A process, B, is multi-threaded with user-level thread scheduling. If one of the threads has a long calculation before making a thread library call, does this mean other processes will have to wait? What happens in the schedulers?
 

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pause(2)							System Calls Manual							  pause(2)

NAME
pause - suspend process until signal SYNOPSIS
DESCRIPTION
suspends the calling process until it receives a signal. The signal must be one that is not currently set to be ignored or blocked (masked) by the calling process. If the signal causes termination of the calling process, does not return. If the signal is by the calling process and control is returned from the signal-catching function (see signal(5)), the calling process resumes execution from the point of suspension; with a return value of -1 from and set to APPLICATION USAGE
Threads Considerations Signal dispositions (such as catch/default/ignore) are shared by all threads in the process and blocked signal masks are maintained by each thread. Therefore, the signals being waited for should not be ignored by the process or blocked by the calling thread. will suspend only the calling thread until it receives a signal. If other threads in the process do not block the signal, the signal may be delivered to another thread in the process and the thread in may continue waiting. For this reason, the use of is recommended instead of for multi-threaded applications. For more information regarding signals and threads, refer to signal(5). SEE ALSO
alarm(2), kill(2), sigwait(2), wait(2), signal(5). STANDARDS CONFORMANCE
pause(2)
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