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internal/poll: use ignoringEINTR in Darwin Fsync

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Also add comment explaining why we don't use ignoringEINTR around
call to close.

Fixes #41115

Change-Id: Ia7bbe01eaf26003f70d184b7e82803efef2b2c18
Reviewed-on: https://go-review.googlesource.com/c/go/+/258542
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
This commit is contained in:
Ian Lance Taylor 2020-09-30 17:37:24 -07:00
parent 846dce9d05
commit b8ec1d5f49
2 changed files with 11 additions and 3 deletions
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7
src/internal/poll/fd_fsync_darwin.go
View File

@ -14,7 +14,8 @@ func (fd *FD) Fsync() error {
return err
}
defer fd.decref()
_, e1 := fcntl(fd.Sysfd, syscall.F_FULLFSYNC, 0)
return e1
return ignoringEINTR(func() error {
_, err := fcntl(fd.Sysfd, syscall.F_FULLFSYNC, 0)
return err
})
}

7
src/internal/poll/fd_unix.go
View File

@ -74,7 +74,14 @@ func (fd *FD) destroy() error {
// Poller may want to unregister fd in readiness notification mechanism,
// so this must be executed before CloseFunc.
fd.pd.close()
// We don't use ignoringEINTR here because POSIX does not define
// whether the descriptor is closed if close returns EINTR.
// If the descriptor is indeed closed, using a loop would race
// with some other goroutine opening a new descriptor.
// (The Linux kernel guarantees that it is closed on an EINTR error.)
err := CloseFunc(fd.Sysfd)
fd.Sysfd = -1
runtime_Semrelease(&fd.csema)
return err