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ext/socket/ancdata.c (bsock_recvmsg_internal): reduce stack use

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Using 8K stack is probably too much.  As reference, ALLOCV falls
back to heap allocation at a mere 1K.  Since
bsock_recvmsg_internal is a function which will always allocate
and can trigger GC, it is in our best interest to minimize
stack usage to avoid scanning 8K of stack on GC.

[ruby-core:69595] [Feature #11263]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51003 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
normal 2015-06-23 23:40:53 +00:00
parent c23a7b0db8
commit d9d1b20d39
2 changed files with 18 additions and 25 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Wed Jun 24 08:28:15 2015 Eric Wong <e@80x24.org>
* ext/socket/ancdata.c (bsock_recvmsg_internal): reduce stack use
[ruby-core:69595] [Feature #11263]
Tue Jun 23 14:32:42 2015 Nobuyoshi Nakada <nobu@ruby-lang.org>
* error.c (name_err_receiver): raise ArgumentError if no receiver

38
ext/socket/ancdata.c
View file

@ -1498,7 +1498,7 @@ bsock_recvmsg_internal(int argc, VALUE *argv, VALUE sock, int nonblock)
struct msghdr mh;
struct iovec iov;
union_sockaddr namebuf;
char datbuf0[4096], *datbuf;
char *datbuf;
VALUE dat_str = Qnil;
VALUE ret;
ssize_t ss;
@ -1506,10 +1506,6 @@ bsock_recvmsg_internal(int argc, VALUE *argv, VALUE sock, int nonblock)
#if defined(HAVE_STRUCT_MSGHDR_MSG_CONTROL)
struct cmsghdr *cmh;
size_t maxctllen;
union {
char bytes[4096];
struct cmsghdr align;
} ctlbuf0;
char *ctlbuf;
VALUE ctl_str = Qnil;
int family;
@ -1519,9 +1515,9 @@ bsock_recvmsg_internal(int argc, VALUE *argv, VALUE sock, int nonblock)
rb_scan_args(argc, argv, "03:", &vmaxdatlen, &vflags, &vmaxctllen, &vopts);
maxdatlen = NIL_P(vmaxdatlen) ? sizeof(datbuf0) : NUM2SIZET(vmaxdatlen);
maxdatlen = NIL_P(vmaxdatlen) ? 4096 : NUM2SIZET(vmaxdatlen);
#if defined(HAVE_STRUCT_MSGHDR_MSG_CONTROL)
maxctllen = NIL_P(vmaxctllen) ? sizeof(ctlbuf0) : NUM2SIZET(vmaxctllen);
maxctllen = NIL_P(vmaxctllen) ? 4096 : NUM2SIZET(vmaxctllen);
#else
if (!NIL_P(vmaxctllen))
rb_raise(rb_eArgError, "control message not supported");
@ -1561,26 +1557,18 @@ bsock_recvmsg_internal(int argc, VALUE *argv, VALUE sock, int nonblock)
#endif
retry:
if (maxdatlen <= sizeof(datbuf0))
datbuf = datbuf0;
else {
if (NIL_P(dat_str))
dat_str = rb_str_tmp_new(maxdatlen);
else
rb_str_resize(dat_str, maxdatlen);
datbuf = RSTRING_PTR(dat_str);
}
if (NIL_P(dat_str))
dat_str = rb_str_tmp_new(maxdatlen);
else
rb_str_resize(dat_str, maxdatlen);
datbuf = RSTRING_PTR(dat_str);
#if defined(HAVE_STRUCT_MSGHDR_MSG_CONTROL)
if (maxctllen <= sizeof(ctlbuf0))
ctlbuf = ctlbuf0.bytes;
else {
if (NIL_P(ctl_str))
ctl_str = rb_str_tmp_new(maxctllen);
else
rb_str_resize(ctl_str, maxctllen);
ctlbuf = RSTRING_PTR(ctl_str);
}
if (NIL_P(ctl_str))
ctl_str = rb_str_tmp_new(maxctllen);
else
rb_str_resize(ctl_str, maxctllen);
ctlbuf = RSTRING_PTR(ctl_str);
#endif
memset(&mh, 0, sizeof(mh));