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stage2: Bypass file locks in src/Cache.zig for WASI targets

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This commit is contained in:
Cody Tapscott 2022-03-01 10:42:07 -07:00
parent 922d8378e7
commit 089651716c
1 changed files with 11 additions and 7 deletions
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18
src/Cache.zig
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@ -762,18 +762,22 @@ pub const Manifest = struct {
fn downgradeToSharedLock(self: *Manifest) !void {
if (!self.have_exclusive_lock) return;
const manifest_file = self.manifest_file.?;
try manifest_file.downgradeLock();
if (std.process.can_spawn or !builtin.single_threaded) { // Some targets (WASI) do not support flock
const manifest_file = self.manifest_file.?;
try manifest_file.downgradeLock();
}
self.have_exclusive_lock = false;
}
fn upgradeToExclusiveLock(self: *Manifest) !void {
if (self.have_exclusive_lock) return;
const manifest_file = self.manifest_file.?;
// Here we intentionally have a period where the lock is released, in case there are
// other processes holding a shared lock.
manifest_file.unlock();
try manifest_file.lock(.Exclusive);
if (std.process.can_spawn or !builtin.single_threaded) { // Some targets (WASI) do not support flock
const manifest_file = self.manifest_file.?;
// Here we intentionally have a period where the lock is released, in case there are
// other processes holding a shared lock.
manifest_file.unlock();
try manifest_file.lock(.Exclusive);
}
self.have_exclusive_lock = true;
}