https://git.ruby-lang.org/ruby.git/commit/?id=fc50b2eae5

From fc50b2eae5b1f73d7be790e7e864f810d2bebdc9 Mon Sep 17 00:00:00 2001
From: "S.H" <gamelinks007@g...>
Date: Thu, 22 Jul 2021 15:41:03 +0900
Subject: Remove unneeded function declarations

---
 process.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/process.c b/process.c
index 216aba6..fa8c69d 100644
--- a/process.c
+++ b/process.c
@@ -1077,10 +1077,6 @@ struct waitpid_state { https://github.com/ruby/ruby/blob/trunk/process.c#L1077
     int errnum;
 };
 
-void rb_native_mutex_lock(rb_nativethread_lock_t *);
-void rb_native_mutex_unlock(rb_nativethread_lock_t *);
-void rb_native_cond_signal(rb_nativethread_cond_t *);
-void rb_native_cond_wait(rb_nativethread_cond_t *, rb_nativethread_lock_t *);
 int rb_sigwait_fd_get(const rb_thread_t *);
 void rb_sigwait_sleep(const rb_thread_t *, int fd, const rb_hrtime_t *);
 void rb_sigwait_fd_put(const rb_thread_t *, int fd);
-- 
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