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Current File : /././././proc/self/root/opt/alt/ruby18/lib64/ruby/1.8/x86_64-linux/rubysig.h
/**********************************************************************

  rubysig.h -

  $Author: shyouhei $
  $Date: 2009-01-05 11:16:18 +0900 (Mon, 05 Jan 2009) $
  created at: Wed Aug 16 01:15:38 JST 1995

  Copyright (C) 1993-2003 Yukihiro Matsumoto

**********************************************************************/

#ifndef SIG_H
#define SIG_H
#include <errno.h>

#ifdef _WIN32
typedef LONG rb_atomic_t;

# define ATOMIC_TEST(var) InterlockedExchange(&(var), 0)
# define ATOMIC_SET(var, val) InterlockedExchange(&(var), (val))
# define ATOMIC_INC(var) InterlockedIncrement(&(var))
# define ATOMIC_DEC(var) InterlockedDecrement(&(var))

/* Windows doesn't allow interrupt while system calls */
# define TRAP_BEG do {\
    int saved_errno = 0;\
    rb_atomic_t trap_immediate = ATOMIC_SET(rb_trap_immediate, 1)
# define TRAP_END\
    ATOMIC_SET(rb_trap_immediate, trap_immediate);\
    saved_errno = errno;\
    CHECK_INTS;\
    errno = saved_errno;\
} while (0)
# define RUBY_CRITICAL(statements) do {\
    rb_w32_enter_critical();\
    statements;\
    rb_w32_leave_critical();\
} while (0)
#else
typedef int rb_atomic_t;

# define ATOMIC_TEST(var) ((var) ? ((var) = 0, 1) : 0)
# define ATOMIC_SET(var, val) ((var) = (val))
# define ATOMIC_INC(var) (++(var))
# define ATOMIC_DEC(var) (--(var))

# define TRAP_BEG do {\
    int saved_errno = 0;\
    int trap_immediate = rb_trap_immediate;\
    rb_trap_immediate = 1
# define TRAP_END rb_trap_immediate = trap_immediate;\
    saved_errno = errno;\
    CHECK_INTS;\
    errno = saved_errno;\
} while (0)

# define RUBY_CRITICAL(statements) do {\
    int trap_immediate = rb_trap_immediate;\
    rb_trap_immediate = 0;\
    statements;\
    rb_trap_immediate = trap_immediate;\
} while (0)
#endif
RUBY_EXTERN rb_atomic_t rb_trap_immediate;

RUBY_EXTERN int rb_prohibit_interrupt;
#define DEFER_INTS (rb_prohibit_interrupt++)
#define ALLOW_INTS do {\
    rb_prohibit_interrupt--;\
    CHECK_INTS;\
} while (0)
#define ENABLE_INTS (rb_prohibit_interrupt--)

VALUE rb_with_disable_interrupt _((VALUE(*)(ANYARGS),VALUE));

RUBY_EXTERN rb_atomic_t rb_trap_pending;
void rb_trap_restore_mask _((void));

RUBY_EXTERN int rb_thread_critical;
RUBY_EXTERN int rb_thread_pending;
void rb_thread_schedule _((void));
#if defined(HAVE_SETITIMER) || defined(_THREAD_SAFE)
# define CHECK_INTS do {\
    if (!(rb_prohibit_interrupt || rb_thread_critical)) {\
	if (rb_thread_pending) rb_thread_schedule();\
	if (rb_trap_pending) rb_trap_exec();\
    }\
} while (0)
#else
/* pseudo preemptive thread switching */
RUBY_EXTERN int rb_thread_tick;
#define THREAD_TICK 500
#define CHECK_INTS do {\
    if (!(rb_prohibit_interrupt || rb_thread_critical)) {\
	if (rb_thread_pending || rb_thread_tick-- <= 0) {\
	    rb_thread_tick = THREAD_TICK;\
	    rb_thread_schedule();\
	}\
    }\
    if (rb_trap_pending) rb_trap_exec();\
} while (0)
#endif

#endif

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