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io + socket: make pipes and sockets nonblocking by default

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All normal Ruby IO methods (IO#read, IO#gets, IO#write, ...) are
all capable of appearing to be "blocking" when presented with a
file description with the O_NONBLOCK flag set; so there is
little risk of incompatibility within Ruby-using programs.

The biggest compatibility risk is when spawning external
programs.  As a result, stdin, stdout, and stderr are now always
made blocking before exec-family calls.

This change will make an event-oriented MJIT usable if it is
waiting on pipes on POSIX_like platforms.

It is ALSO necessary to take advantage of (proposed lightweight
concurrency (aka "auto-Fiber") or any similar proposal for
network concurrency: https://bugs.ruby-lang.org/issues/13618

Named-pipe (FIFO) are NOT yet non-blocking by default since
they are rarely-used and may introduce compatibility problems
and extra syscall overhead for a common path.

Please revert this commit if there are problems and if I am afk
since I am afk a lot, lately.

[ruby-core:89950] [Bug #14968]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65922 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
normal 2018-11-22 08:46:51 +00:00
parent b009de13bf
commit 6a65f2b1e4
14 changed files with 139 additions and 46 deletions
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14
ext/socket/init.c
View file

@ -435,7 +435,7 @@ rsock_socket0(int domain, int type, int proto)
static int cloexec_state = -1; /* <0: unknown, 0: ignored, >0: working */
if (cloexec_state > 0) { /* common path, if SOCK_CLOEXEC is defined */
ret = socket(domain, type|SOCK_CLOEXEC, proto);
ret = socket(domain, type|SOCK_CLOEXEC|SOCK_NONBLOCK, proto);
if (ret >= 0) {
if (ret <= 2)
goto fix_cloexec;
@ -443,7 +443,7 @@ rsock_socket0(int domain, int type, int proto)
}
}
else if (cloexec_state < 0) { /* usually runs once only for detection */
ret = socket(domain, type|SOCK_CLOEXEC, proto);
ret = socket(domain, type|SOCK_CLOEXEC|SOCK_NONBLOCK, proto);
if (ret >= 0) {
cloexec_state = rsock_detect_cloexec(ret);
if (cloexec_state == 0 || ret <= 2)
@ -466,6 +466,7 @@ rsock_socket0(int domain, int type, int proto)
return -1;
fix_cloexec:
rb_maygvl_fd_fix_cloexec(ret);
rsock_make_fd_nonblock(ret);
update_max_fd:
rb_update_max_fd(ret);
@ -632,8 +633,8 @@ rsock_connect(int fd, const struct sockaddr *sockaddr, int len, int socks)
return status;
}
static void
make_fd_nonblock(int fd)
void
rsock_make_fd_nonblock(int fd)
{
int flags;
#ifdef F_GETFL
@ -659,6 +660,7 @@ cloexec_accept(int socket, struct sockaddr *address, socklen_t *address_len,
#ifdef HAVE_ACCEPT4
static int try_accept4 = 1;
#endif
nonblock = 1; /* TODO remove parameter */
if (address_len) len0 = *address_len;
#ifdef HAVE_ACCEPT4
if (try_accept4) {
@ -678,7 +680,7 @@ cloexec_accept(int socket, struct sockaddr *address, socklen_t *address_len,
rb_maygvl_fd_fix_cloexec(ret);
#ifndef SOCK_NONBLOCK
if (nonblock) {
make_fd_nonblock(ret);
rsock_make_fd_nonblock(ret);
}
#endif
if (address_len && len0 < *address_len) *address_len = len0;
@ -695,7 +697,7 @@ cloexec_accept(int socket, struct sockaddr *address, socklen_t *address_len,
if (address_len && len0 < *address_len) *address_len = len0;
rb_maygvl_fd_fix_cloexec(ret);
if (nonblock) {
make_fd_nonblock(ret);
rsock_make_fd_nonblock(ret);
}
return ret;
}