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authornormal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2019-01-04 13:14:11 +0000
committernormal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2019-01-04 13:14:11 +0000
commit23444302d9200bcc41ce279a529f73cad63c3f05 (patch)
treecb541d972fd43a434593dca6c3aebcfcdd8fe560 /ext/-test-
parent16cfd26a57c30e17bc3c116c83134420693ba5c4 (diff)
introduce rb_nogvl C-API to mark ubf as async-signal-safe
zlib and bignum both contain unblocking functions which are async-signal-safe and do not require spawning additional threads. We can execute those functions directly in signal handlers without incurring overhead of extra threads, so provide C-API users the ability to deal with that. Other C-API users may have similar need. This flexible API can supercede existing uses of rb_thread_call_without_gvl and rb_thread_call_without_gvl2 by introducing a flags argument to control behavior. Note: this API is NOT finalized. It needs approval from other committers. I prefer shorter name than previous rb_thread_call_without_gvl* functions because my eyes requires big fonts. [Bug #15499] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66712 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'ext/-test-')
-rw-r--r--ext/-test-/gvl/call_without_gvl/call_without_gvl.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/ext/-test-/gvl/call_without_gvl/call_without_gvl.c b/ext/-test-/gvl/call_without_gvl/call_without_gvl.c
index f3071d5768..654c979479 100644
--- a/ext/-test-/gvl/call_without_gvl/call_without_gvl.c
+++ b/ext/-test-/gvl/call_without_gvl/call_without_gvl.c
@@ -27,8 +27,49 @@ thread_runnable_sleep(VALUE thread, VALUE timeout)
return thread;
}
+struct loop_ctl {
+ int notify_fd;
+ volatile int stop;
+};
+
+static void *
+do_loop(void *p)
+{
+ struct loop_ctl *ctl = p;
+
+ /* tell the waiting process they can interrupt us, now */
+ write(ctl->notify_fd, "", 1);
+
+ while (!ctl->stop) {
+ struct timeval tv = { 0, 10000 };
+ select(0, NULL, NULL, NULL, &tv);
+ }
+ return 0;
+}
+
+static void
+stop_set(void *p)
+{
+ struct loop_ctl *ctl = p;
+
+ ctl->stop = 1;
+}
+
+static VALUE
+thread_ubf_async_safe(VALUE thread, VALUE notify_fd)
+{
+ struct loop_ctl ctl;
+
+ ctl.notify_fd = NUM2INT(notify_fd);
+ ctl.stop = 0;
+
+ rb_nogvl(do_loop, &ctl, stop_set, &ctl, RB_NOGVL_UBF_ASYNC_SAFE);
+ return thread;
+}
+
void
Init_call_without_gvl(void)
{
rb_define_method(rb_cThread, "__runnable_sleep__", thread_runnable_sleep, 1);
+ rb_define_method(rb_cThread, "__ubf_async_safe__", thread_ubf_async_safe, 1);
}