Paul Smith fd1dd7c398 [SV 44555] Use vfork() instead of fork() where available. ... Testing has shown that vfork() is actually significantly more efficient on systems where it's supported, even for copy-on-write implementations. If make is big enough, duplicating the page tables is significant overhead. * configure.ac: Check for fork/vfork. * makeint.h: Include vfork.h and set up #define for it. * os.h, posixos.c (get_bad_stdin): For children who can't use the normal stdin file descriptor, get a broken one. * job.c (start_job_command): Avoid so many ifdefs and simplify the invocation of child_execute_job() (child_execute_job): move the fork operation here so it can return early for the parent process. Switch to use vfork(). * function.c (func_shell_base): Use new child_execute_job() and simplify ifdefs. * job.h, main.c, remote-cstms.c, vmsjobs.c, w32os.c: Update declarations and calls.		2016-03-13 01:12:07 -05:00
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w32os.c	[SV 44555] Use vfork() instead of fork() where available.	2016-03-13 01:12:07 -05:00