signal.c: clear received signal at stack overflow

* signal.c (check_stack_overflow): clear the received reserved
  signal before raising stack overflow but not aborting.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48910 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

signal.c

@@ -746,6 +746,7 @@ rb_get_next_signal(void)
 
 #if defined(USE_SIGALTSTACK) || defined(_WIN32)
 NORETURN(void ruby_thread_stack_overflow(rb_thread_t *th));
+static const char *received_signal;
 # if !(defined(HAVE_UCONTEXT_H) && (defined __i386__ || defined __x86_64__ || defined __amd64__))
 # elif defined __linux__
 #   define USE_UCONTEXT_REG 1
@@ -792,6 +793,7 @@ check_stack_overflow(const uintptr_t addr, const ucontext_t *ctx)
 	     * place. */
 	    th->tag = th->tag->prev;
 	}
+	received_signal = 0;
 	ruby_thread_stack_overflow(th);
     }
 }
@@ -802,6 +804,7 @@ check_stack_overflow(const void *addr)
     int ruby_stack_overflowed_p(const rb_thread_t *, const void *);
     rb_thread_t *th = ruby_current_thread;
     if (ruby_stack_overflowed_p(th, addr)) {
+	received_signal = 0;
 	ruby_thread_stack_overflow(th);
     }
 }
@@ -886,8 +889,7 @@ sigill(int sig SIGINFO_ARG)
 static void
 check_reserved_signal_(const char *name, size_t name_len)
 {
-    static const char *received;
-    const char *prev = ATOMIC_PTR_EXCHANGE(received, name);
+    const char *prev = ATOMIC_PTR_EXCHANGE(received_signal, name);
 
     if (prev) {
 	ssize_t RB_UNUSED_VAR(err);