DragonFly commits List (threaded) for 2004-12
cvs commit: src/usr.bin/make
okumoto 2004/12/09 17:16:25 PST
DragonFly src repository
usr.bin/make job.c job.h main.c make.c
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
1.25 +115 -28 src/usr.bin/make/job.c
1.14 +1 -1 src/usr.bin/make/job.h
1.30 +3 -0 src/usr.bin/make/main.c
1.11 +2 -2 src/usr.bin/make/make.c