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Appendix B - Pthreads Draft 4 vs. the Final Standard

Pthreads Programming
Bradford Nichols, Dick Buttlar and Jacqueline Proulx Farrell
 Copyright © 1996 O'Reilly & Associates, Inc.

Signals
Feature: Whereas the final standard requires vendors to provide the pthread_kill function, Draft 4 left it optional. If a given Draft 4 implementation supports it, the compile-time constant _POSIX_THREADS_PER_THREAD_SIGNALS_1 is true. 
Syntax: To manipulate per-thread signal masks in a Draft 4 implementation, you call the POSIX.1 sigprocmask function. (Draft 4 defined a thread-specific version of this call.) In an implementation that complies with the final standard, you call pthread_sigmask. Note that the final standard leaves the behavior of sigprocmask in a multithreaded program undefined. 

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