## Calling UNIX Services

On a UNIX system that does not have kernel support for threads, making system and library calls from within a multithreaded program raises the following issues:

· System calls may not be thread-reentrant.

· If a system call blocks, it blocks the entire process instead of blocking the calling thread only.

More:

Jacket Routines

Blocking System Calls

Calling fork( ) in a Multithreaded Environment

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