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Fix a race condition caused by zap_deps().

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We can't just delete all the dependencies at the beginning and re-add them:
other people might be checking the same dependencies in parallel.  Instead,
mark them as delete_me up front, and then after the build completes, remove
only the delete_me entries.
This commit is contained in:
Avery Pennarun 2010-12-11 22:59:55 -08:00
commit c64b8a3eb1
2 changed files with 14 additions and 9 deletions
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15
state.py
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@ -72,6 +72,7 @@ def db():
" (target int, "
" source int, "
" mode not null, "
" delete_me int, "
" primary key (target,source))")
_db.execute("insert into Schema (version) values (?)", [SCHEMA_VER])
# eat the '0' runid and File id
@ -253,17 +254,21 @@ class File(object):
assert(mode in ('c', 'm'))
yield mode,File(cols=cols)
def zap_deps(self):
debug2('zap-deps: %r\n' % self.name)
_write('delete from Deps where target=?', [self.id])
def zap_deps1(self):
debug2('zap-deps1: %r\n' % self.name)
_write('update Deps set delete_me=? where target=?', [True, self.id])
def zap_deps2(self):
debug2('zap-deps2: %r\n' % self.name)
_write('delete from Deps where target=? and delete_me=1', [self.id])
def add_dep(self, mode, dep):
src = File(name=dep)
debug2('add-dep: %r < %s %r\n' % (self.name, mode, src.name))
assert(self.id != src.id)
_write("insert or replace into Deps "
" (target, mode, source) values (?,?,?)",
[self.id, mode, src.id])
" (target, mode, source, delete_me) values (?,?,?,?)",
[self.id, mode, src.id, False])
def read_stamp(self):
try: