3 Commits

Author	SHA1	Message	Date
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
Paul Smith	85c788572d	[SV 46261] Use pselect() for jobserver where supported. ... * Makefile.am, configure.ac: Check for pselect() and sys/select.h. * main.c (main): Block SIGCHLD if we have pselect() support. * posixos.c (jobserver_acquire): If we support pselect() then use it to query the jobserver pipe, while also listening for SIGCHLD. Also pselect() supports a timeout so avoid alarm() calls.	2016-03-08 23:40:46 -05:00
Paul Smith	fb7a7adc8a	Extract jobserver implementation into OS-specific files. ... * os.h, posixos.c, w32/w32os.c: New files implementing jobserver. * job.c, job.h, main.c, makeint.h: Move content to new files. * w32/include/sub_proc.h, w32/subproc/sub_proc.c: Ditto. * Makefile.am: Build and package OS-specific files. * build_w32.bat, make_msvc_net2003.vcproj, README.W32.template: Update for new files, and clean up the build. * POTFILES.in, maintMakefile, NMakefile.template: Ditto. * w32/subproc/build.bat: Delete as unused.	2016-03-08 23:40:46 -05:00