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Use local jobslots as fallback on Windows.

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As we have no make jobserver support on windows, fallback to using
process local slots to limit prallelism.
This commit is contained in:
Jannis Harder 2022-07-13 18:14:19 +02:00
parent b0786aea43
commit e91977e01e
1 changed files with 21 additions and 10 deletions
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31
sbysrc/sby_jobserver.py
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@ -17,7 +17,6 @@
#
import atexit
import fcntl
import os
import select
import shlex
@ -26,6 +25,8 @@ import sys
import weakref
import signal
if os.name == "posix":
import fcntl
inherited_jobcount = None
inherited_jobserver_auth = None
@ -56,15 +57,16 @@ def process_jobserver_environment():
pass
elif flag.startswith("--jobserver-auth=") or flag.startswith("--jobserver-fds="):
inherited_jobserver_auth_present = True
arg = flag.split("=", 1)[1].split(",")
try:
jobserver_fds = int(arg[0]), int(arg[1])
for fd in jobserver_fds:
fcntl.fcntl(fd, fcntl.F_GETFD)
except (ValueError, OSError):
pass
else:
inherited_jobserver_auth = jobserver_fds
if os.name == "posix":
arg = flag.split("=", 1)[1].split(",")
try:
jobserver_fds = int(arg[0]), int(arg[1])
for fd in jobserver_fds:
fcntl.fcntl(fd, fcntl.F_GETFD)
except (ValueError, OSError):
pass
else:
inherited_jobserver_auth = jobserver_fds
def jobserver_helper(jobserver_read_fd, jobserver_write_fd, request_fd, response_fd):
@ -159,6 +161,12 @@ class SbyJobClient:
have_jobserver = inherited_jobserver_auth_present
if os.name == "nt" and inherited_jobserver_auth_present:
# There are even more incompatible variants of the make jobserver on
# windows, none of them are supported for now.
print("WARNING: Found jobserver in MAKEFLAGS, this is not supported on windows.")
have_jobserver = False
if have_jobserver and inherited_jobserver_auth is None:
print("WARNING: Could not connect to jobserver specified in MAKEFLAGS, disabling parallel execution.")
have_jobserver = False
@ -178,6 +186,9 @@ class SbyJobClient:
if have_jobserver:
self.read_fd, self.write_fd = inherited_jobserver_auth
elif os.name == "nt":
# On Windows, without a jobserver, use only local slots
self.local_slots = jobcount
else:
self.sby_jobserver = SbyJobServer(jobcount)
self.read_fd = self.sby_jobserver.read_fd