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io.c (io_write_nonblock): add RB_GC_GUARD, io_fflush may switch threads

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Since io_fflush may block on mutex or rb_io_wait_readable and
switch threads, we need to ensure the `str' VALUE returned by
`rb_obj_as_string` is visible to GC.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66242 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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normal 2018-12-06 10:09:30 +00:00
parent 956d35e2d0
commit 48324dd4db
1 changed files with 1 additions and 0 deletions
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io.c
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@ -3001,6 +3001,7 @@ io_write_nonblock(VALUE io, VALUE str, VALUE ex)
rb_io_set_nonblock(fptr); rb_io_set_nonblock(fptr);
n = write(fptr->fd, RSTRING_PTR(str), RSTRING_LEN(str)); n = write(fptr->fd, RSTRING_PTR(str), RSTRING_LEN(str));
RB_GC_GUARD(str);
if (n < 0) { if (n < 0) {
int e = errno; int e = errno;