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syscall: Permit non-blocking syscalls.

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Permit system calls to be designated as non-blocking, meaning
that we simply call them without involving the scheduler.

This change by itself is mostly performance neutral.  In
combination with a following change to the net package there
is a performance advantage.

R=rsc, dfc, r2, iant2, rsc1
CC=golang-dev
https://golang.org/cl/4278055
This commit is contained in:
Ian Lance Taylor 2011-03-16 19:03:01 -07:00
parent e39dc76884
commit 4fd41e494a
25 changed files with 579 additions and 383 deletions
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14
src/pkg/syscall/syscall_bsd.go
View file

@ -27,8 +27,8 @@ func Getwd() (string, int) { return "", ENOTSUP }
* Wrapped
*/
//sys getgroups(ngid int, gid *_Gid_t) (n int, errno int)
//sys setgroups(ngid int, gid *_Gid_t) (errno int)
//sysnb getgroups(ngid int, gid *_Gid_t) (n int, errno int)
//sysnb setgroups(ngid int, gid *_Gid_t) (errno int)
func Getgroups() (gids []int, errno int) {
n, err := getgroups(0, nil)
@ -130,7 +130,7 @@ func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int,
return
}
//sys pipe() (r int, w int, errno int)
//sysnb pipe() (r int, w int, errno int)
func Pipe(p []int) (errno int) {
if len(p) != 2 {
@ -148,10 +148,10 @@ func Sleep(ns int64) (errno int) {
//sys accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, errno int)
//sys bind(s int, addr uintptr, addrlen _Socklen) (errno int)
//sys connect(s int, addr uintptr, addrlen _Socklen) (errno int)
//sys socket(domain int, typ int, proto int) (fd int, errno int)
//sysnb socket(domain int, typ int, proto int) (fd int, errno int)
//sys setsockopt(s int, level int, name int, val uintptr, vallen int) (errno int)
//sys getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
//sys getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
//sysnb getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
//sysnb getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
//sys Shutdown(s int, how int) (errno int)
// For testing: clients can set this flag to force
@ -355,7 +355,7 @@ func Socket(domain, typ, proto int) (fd, errno int) {
return
}
//sys socketpair(domain int, typ int, proto int, fd *[2]int) (errno int)
//sysnb socketpair(domain int, typ int, proto int, fd *[2]int) (errno int)
func Socketpair(domain, typ, proto int) (fd [2]int, errno int) {
errno = socketpair(domain, typ, proto, &fd)