cvs commit: src/usr.bin/make job.c job.h main.c make.c

[Poul-Henning Kamp]

phk         2004-11-12 08:58:07 UTC

  FreeBSD src repository

  Modified files:
    usr.bin/make         job.c job.h main.c make.c 
  Log:
  Add code to enforce the paralleism count (-j N) for the entire tree
  of submakes spawned during processing.
  
  We create a fifo and stuff one character into it for each job we are
  allowed to run.  The name of the fifo is passed to child processes
  in the MAKE_JOBS_FIFO environment variable.
  
  A make which finds this variable on startup will open the fifo and
  only spawn jobs when it managed to read a token from the fifo.
  When the job completes a token is writen back to the fifo.
  
  Slave make processes get one token for free: the one their parent
  make got in order to run them.  This makes the make processes
  themselves invisible in the process counts.
  
  The net effect is that "make -j 12 -s buildworld" will start at
  most 12 jobs at the same time, instead of as previously up to
  65 jobs would get started.
  
  Revision  Changes    Path
  1.57      +114 -28   src/usr.bin/make/job.c
  1.26      +1 -1      src/usr.bin/make/job.h
  1.96      +2 -0      src/usr.bin/make/main.c
  1.25      +2 -2      src/usr.bin/make/make.c