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docs, parallelism: Fix failure path and add comment

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Rasmus noted that the failure path didn't correctly exit. Fix this and
add another comment about GNU Make's job server environment variable
names over time.

Reported-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Link: https://lore.kernel.org/lkml/eb25959a-9ec4-3530-2031-d9d716b40b20@rasmusvillemoes.dk
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20191121205929.40371-2-keescook@chromium.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Kees Cook 2019-11-21 12:59:27 -08:00 committed by Jonathan Corbet
parent e3fedd570d
commit 4920323cff
1 changed files with 3 additions and 0 deletions
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3
scripts/jobserver-count
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@ -24,6 +24,8 @@ try:
flags = os.environ['MAKEFLAGS']
# Look for "--jobserver=R,W"
# Note that GNU Make has used --jobserver-fds and --jobserver-auth
# so this handles all of them.
opts = [x for x in flags.split(" ") if x.startswith("--jobserver")]
# Parse out R,W file descriptor numbers and set them nonblocking.
@ -53,6 +55,7 @@ os.write(writer, jobs)
# If the jobserver was (impossibly) full or communication failed, use default.
if len(jobs) < 1:
print(default)
sys.exit(0)
# Report available slots (with a bump for our caller's reserveration).
print(len(jobs) + 1)