/usr/include/ruby-2.0.0/ruby/thread.h is in ruby2.0-dev 2.0.0.484-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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thread.h -
$Author: matz $
created at: Tue Jul 10 17:35:43 JST 2012
Copyright (C) 2007 Yukihiro Matsumoto
**********************************************************************/
#ifndef RUBY_THREAD_H
#define RUBY_THREAD_H 1
#if defined(__cplusplus)
extern "C" {
#if 0
} /* satisfy cc-mode */
#endif
#endif
#include "ruby/intern.h"
#if defined __GNUC__ && __GNUC__ >= 4
#pragma GCC visibility push(default)
#endif
void *rb_thread_call_with_gvl(void *(*func)(void *), void *data1);
void *rb_thread_call_without_gvl(void *(*func)(void *), void *data1,
rb_unblock_function_t *ubf, void *data2);
void *rb_thread_call_without_gvl2(void *(*func)(void *), void *data1,
rb_unblock_function_t *ubf, void *data2);
#define RUBY_CALL_WO_GVL_FLAG_SKIP_CHECK_INTS_AFTER 0x01
#define RUBY_CALL_WO_GVL_FLAG_SKIP_CHECK_INTS_
#if defined __GNUC__ && __GNUC__ >= 4
#pragma GCC visibility pop
#endif
#if defined(__cplusplus)
#if 0
{ /* satisfy cc-mode */
#endif
} /* extern "C" { */
#endif
#endif /* RUBY_THREAD_H */
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