--- /dev/null
+/*
+ * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
+ * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
+ * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
+ * Copyright (c) 1999 by Hewlett-Packard Company. All rights reserved.
+ *
+ *
+ * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+ * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
+ *
+ * Permission is hereby granted to use or copy this program
+ * for any purpose, provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ */
+
+#ifndef GC_LOCKS_H
+#define GC_LOCKS_H
+
+/*
+ * Mutual exclusion between allocator/collector routines.
+ * Needed if there is more than one allocator thread.
+ * DCL_LOCK_STATE declares any local variables needed by LOCK and UNLOCK.
+ *
+ * Note that I_HOLD_LOCK and I_DONT_HOLD_LOCK are used only positively
+ * in assertions, and may return TRUE in the "don't know" case.
+ */
+# ifdef THREADS
+
+# if defined(GC_PTHREADS) && !defined(GC_WIN32_THREADS)
+# include "atomic_ops.h"
+# endif
+
+ GC_API void GC_CALL GC_noop1(word);
+# ifdef PCR
+# include <base/PCR_Base.h>
+# include <th/PCR_Th.h>
+ GC_EXTERN PCR_Th_ML GC_allocate_ml;
+# define DCL_LOCK_STATE \
+ PCR_ERes GC_fastLockRes; PCR_sigset_t GC_old_sig_mask
+# define UNCOND_LOCK() PCR_Th_ML_Acquire(&GC_allocate_ml)
+# define UNCOND_UNLOCK() PCR_Th_ML_Release(&GC_allocate_ml)
+# endif
+
+# if !defined(AO_HAVE_test_and_set_acquire) && defined(GC_PTHREADS)
+# define USE_PTHREAD_LOCKS
+# endif
+
+# if defined(GC_WIN32_THREADS) && defined(GC_PTHREADS)
+# define USE_PTHREAD_LOCKS
+# endif
+
+# if defined(GC_RTEMS_PTHREADS)
+# define USE_PTHREAD_LOCKS
+# endif
+
+# if defined(GC_WIN32_THREADS) && !defined(USE_PTHREAD_LOCKS)
+# ifndef WIN32_LEAN_AND_MEAN
+# define WIN32_LEAN_AND_MEAN 1
+# endif
+# define NOSERVICE
+# include <windows.h>
+# define NO_THREAD (DWORD)(-1)
+ GC_EXTERN DWORD GC_lock_holder;
+ GC_EXTERN CRITICAL_SECTION GC_allocate_ml;
+# ifdef GC_ASSERTIONS
+# define UNCOND_LOCK() \
+ { EnterCriticalSection(&GC_allocate_ml); \
+ SET_LOCK_HOLDER(); }
+# define UNCOND_UNLOCK() \
+ { GC_ASSERT(I_HOLD_LOCK()); UNSET_LOCK_HOLDER(); \
+ LeaveCriticalSection(&GC_allocate_ml); }
+# else
+# define UNCOND_LOCK() EnterCriticalSection(&GC_allocate_ml)
+# define UNCOND_UNLOCK() LeaveCriticalSection(&GC_allocate_ml)
+# endif /* !GC_ASSERTIONS */
+# define SET_LOCK_HOLDER() GC_lock_holder = GetCurrentThreadId()
+# define UNSET_LOCK_HOLDER() GC_lock_holder = NO_THREAD
+# define I_HOLD_LOCK() (!GC_need_to_lock \
+ || GC_lock_holder == GetCurrentThreadId())
+# define I_DONT_HOLD_LOCK() (!GC_need_to_lock \
+ || GC_lock_holder != GetCurrentThreadId())
+# elif defined(SN_TARGET_PS3)
+# include <pthread.h>
+ GC_EXTERN pthread_mutex_t GC_allocate_ml;
+# define LOCK() pthread_mutex_lock(&GC_allocate_ml)
+# define UNLOCK() pthread_mutex_unlock(&GC_allocate_ml)
+# elif defined(GC_PTHREADS)
+# include <pthread.h>
+
+ /* Posix allows pthread_t to be a struct, though it rarely is. */
+ /* Unfortunately, we need to use a pthread_t to index a data */
+ /* structure. It also helps if comparisons don't involve a */
+ /* function call. Hence we introduce platform-dependent macros */
+ /* to compare pthread_t ids and to map them to integers. */
+ /* the mapping to integers does not need to result in different */
+ /* integers for each thread, though that should be true as much */
+ /* as possible. */
+ /* Refine to exclude platforms on which pthread_t is struct */
+# if !defined(GC_WIN32_PTHREADS)
+# define NUMERIC_THREAD_ID(id) ((unsigned long)(id))
+# define THREAD_EQUAL(id1, id2) ((id1) == (id2))
+# define NUMERIC_THREAD_ID_UNIQUE
+# else
+# define NUMERIC_THREAD_ID(id) ((unsigned long)(id.p))
+ /* Using documented internal details of win32-pthread library. */
+ /* Faster than pthread_equal(). Should not change with */
+ /* future versions of win32-pthread library. */
+# define THREAD_EQUAL(id1, id2) ((id1.p == id2.p) && (id1.x == id2.x))
+# undef NUMERIC_THREAD_ID_UNIQUE
+ /* Generic definitions based on pthread_equal() always work but */
+ /* will result in poor performance (as NUMERIC_THREAD_ID is */
+ /* defined to just a constant) and weak assertion checking. */
+# endif
+# define NO_THREAD ((unsigned long)(-1l))
+ /* != NUMERIC_THREAD_ID(pthread_self()) for any thread */
+
+# if !defined(THREAD_LOCAL_ALLOC) && !defined(USE_PTHREAD_LOCKS)
+ /* In the THREAD_LOCAL_ALLOC case, the allocation lock tends to */
+ /* be held for long periods, if it is held at all. Thus spinning */
+ /* and sleeping for fixed periods are likely to result in */
+ /* significant wasted time. We thus rely mostly on queued locks. */
+# define USE_SPIN_LOCK
+ GC_EXTERN volatile AO_TS_t GC_allocate_lock;
+ GC_INNER void GC_lock(void);
+ /* Allocation lock holder. Only set if acquired by client through */
+ /* GC_call_with_alloc_lock. */
+# ifdef GC_ASSERTIONS
+# define UNCOND_LOCK() \
+ { if (AO_test_and_set_acquire(&GC_allocate_lock) == AO_TS_SET) \
+ GC_lock(); \
+ SET_LOCK_HOLDER(); }
+# define UNCOND_UNLOCK() \
+ { GC_ASSERT(I_HOLD_LOCK()); UNSET_LOCK_HOLDER(); \
+ AO_CLEAR(&GC_allocate_lock); }
+# else
+# define UNCOND_LOCK() \
+ { if (AO_test_and_set_acquire(&GC_allocate_lock) == AO_TS_SET) \
+ GC_lock(); }
+# define UNCOND_UNLOCK() AO_CLEAR(&GC_allocate_lock)
+# endif /* !GC_ASSERTIONS */
+# else /* THREAD_LOCAL_ALLOC || USE_PTHREAD_LOCKS */
+# ifndef USE_PTHREAD_LOCKS
+# define USE_PTHREAD_LOCKS
+# endif
+# endif /* THREAD_LOCAL_ALLOC || USE_PTHREAD_LOCK */
+# ifdef USE_PTHREAD_LOCKS
+# include <pthread.h>
+ GC_EXTERN pthread_mutex_t GC_allocate_ml;
+# ifdef GC_ASSERTIONS
+# define UNCOND_LOCK() { GC_lock(); SET_LOCK_HOLDER(); }
+# define UNCOND_UNLOCK() \
+ { GC_ASSERT(I_HOLD_LOCK()); UNSET_LOCK_HOLDER(); \
+ pthread_mutex_unlock(&GC_allocate_ml); }
+# else /* !GC_ASSERTIONS */
+# if defined(NO_PTHREAD_TRYLOCK)
+# define UNCOND_LOCK() GC_lock()
+# else /* !defined(NO_PTHREAD_TRYLOCK) */
+# define UNCOND_LOCK() \
+ { if (0 != pthread_mutex_trylock(&GC_allocate_ml)) \
+ GC_lock(); }
+# endif
+# define UNCOND_UNLOCK() pthread_mutex_unlock(&GC_allocate_ml)
+# endif /* !GC_ASSERTIONS */
+# endif /* USE_PTHREAD_LOCKS */
+# define SET_LOCK_HOLDER() \
+ GC_lock_holder = NUMERIC_THREAD_ID(pthread_self())
+# define UNSET_LOCK_HOLDER() GC_lock_holder = NO_THREAD
+# define I_HOLD_LOCK() \
+ (!GC_need_to_lock || \
+ GC_lock_holder == NUMERIC_THREAD_ID(pthread_self()))
+# ifndef NUMERIC_THREAD_ID_UNIQUE
+# define I_DONT_HOLD_LOCK() 1 /* Conservatively say yes */
+# else
+# define I_DONT_HOLD_LOCK() \
+ (!GC_need_to_lock \
+ || GC_lock_holder != NUMERIC_THREAD_ID(pthread_self()))
+# endif
+ GC_EXTERN volatile GC_bool GC_collecting;
+# define ENTER_GC() GC_collecting = 1;
+# define EXIT_GC() GC_collecting = 0;
+ GC_INNER void GC_lock(void);
+ GC_EXTERN unsigned long GC_lock_holder;
+# if defined(GC_ASSERTIONS) && defined(PARALLEL_MARK)
+ GC_EXTERN unsigned long GC_mark_lock_holder;
+# endif
+# endif /* GC_PTHREADS with linux_threads.c implementation */
+ GC_EXTERN GC_bool GC_need_to_lock;
+
+# else /* !THREADS */
+# define LOCK()
+# define UNLOCK()
+# define SET_LOCK_HOLDER()
+# define UNSET_LOCK_HOLDER()
+# define I_HOLD_LOCK() TRUE
+# define I_DONT_HOLD_LOCK() TRUE
+ /* Used only in positive assertions or to test whether */
+ /* we still need to acquire the lock. TRUE works in */
+ /* either case. */
+# endif /* !THREADS */
+
+#if defined(UNCOND_LOCK) && !defined(LOCK)
+ /* At least two thread running; need to lock. */
+# define LOCK() { if (GC_need_to_lock) UNCOND_LOCK(); }
+# define UNLOCK() { if (GC_need_to_lock) UNCOND_UNLOCK(); }
+#endif
+
+# ifndef ENTER_GC
+# define ENTER_GC()
+# define EXIT_GC()
+# endif
+
+# ifndef DCL_LOCK_STATE
+# define DCL_LOCK_STATE
+# endif
+
+#endif /* GC_LOCKS_H */
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