8b5a567b2e
When running a parallel build, redo-log -f (which is auto-started by redo) tries to traverse through the logs depth first, in the order parent processes started subprocesses. This works pretty well, but if its dependencies are locked, a process might have to give up its jobserver token while other stuff builds its dependencies. After the dependency finishes, the parent might not be able to get a token for quite some time, and the logs will appear to stop. To prevent this from happening, we can instantiate up to one "cheater" token, only in the foreground process (the one locked by redo-log -f), which will allow it to continue running, albeit a bit slowly (since it only has one token out of possibly many). When the process finishes, we then destroy the fake token. It gets a little complicated; see explanation at the top of jwack.py.
59 lines
1.7 KiB
Python
Executable file
59 lines
1.7 KiB
Python
Executable file
#!/usr/bin/env python2
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import sys, os, traceback
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import vars_init
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vars_init.init(sys.argv[1:])
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import vars, state, builder, jwack, deps
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from helpers import unlink
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from logs import debug, debug2, err
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def should_build(t):
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f = state.File(name=t)
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if f.is_failed():
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raise builder.ImmediateReturn(32)
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dirty = deps.isdirty(f, depth = '', max_changed = vars.RUNID,
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already_checked=[])
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return f.is_generated, dirty==[f] and deps.DIRTY or dirty
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rv = 202
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try:
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if vars_init.is_toplevel:
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builder.start_stdin_log_reader(status=True, details=True,
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debug_locks=False, debug_pids=False)
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if vars.TARGET and not vars.UNLOCKED:
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me = os.path.join(vars.STARTDIR,
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os.path.join(vars.PWD, vars.TARGET))
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f = state.File(name=me)
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debug2('TARGET: %r %r %r\n' % (vars.STARTDIR, vars.PWD, vars.TARGET))
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else:
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f = me = None
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debug2('redo-ifchange: not adding depends.\n')
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jwack.setup(1)
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try:
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targets = sys.argv[1:]
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if f:
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for t in targets:
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f.add_dep('m', t)
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f.save()
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state.commit()
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rv = builder.main(targets, should_build)
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finally:
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try:
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state.rollback()
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finally:
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try:
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jwack.force_return_tokens()
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except Exception, e:
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traceback.print_exc(100, sys.stderr)
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err('unexpected error: %r\n' % e)
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rv = 1
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except KeyboardInterrupt:
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if vars_init.is_toplevel:
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builder.await_log_reader()
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sys.exit(200)
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state.commit()
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if vars_init.is_toplevel:
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builder.await_log_reader()
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sys.exit(rv)
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