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arch-arm.h
(732 B)
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arch-hppa.h
(552 B)
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arch-ia64.h
(783 B)
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arch-ppc.h
(899 B)
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arch-x86.h
(6.78 KB)
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fallback.h
(4.62 KB)
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generic-acc.h
(2.84 KB)
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generic-gcc.h
(6.89 KB)
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generic-msvc.h
(2.71 KB)
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generic-sunpro.h
(2.54 KB)
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generic-xlc.h
(2.93 KB)
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generic.h
(9.96 KB)
Editing: fallback.h
/*------------------------------------------------------------------------- * * fallback.h * Fallback for platforms without spinlock and/or atomics support. Slower * than native atomics support, but not unusably slow. * * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/port/atomics/fallback.h * *------------------------------------------------------------------------- */ /* intentionally no include guards, should only be included by atomics.h */ #ifndef INSIDE_ATOMICS_H # error "should be included via atomics.h" #endif #ifndef pg_memory_barrier_impl /* * If we have no memory barrier implementation for this architecture, we * fall back to acquiring and releasing a spinlock. This might, in turn, * fall back to the semaphore-based spinlock implementation, which will be * amazingly slow. * * It's not self-evident that every possible legal implementation of a * spinlock acquire-and-release would be equivalent to a full memory barrier. * For example, I'm not sure that Itanium's acq and rel add up to a full * fence. But all of our actual implementations seem OK in this regard. */ #define PG_HAVE_MEMORY_BARRIER_EMULATION extern void pg_spinlock_barrier(void); #define pg_memory_barrier_impl pg_spinlock_barrier #endif #ifndef pg_compiler_barrier_impl /* * If the compiler/arch combination does not provide compiler barriers, * provide a fallback. The fallback simply consists of a function call into * an externally defined function. That should guarantee compiler barrier * semantics except for compilers that do inter translation unit/global * optimization - those better provide an actual compiler barrier. * * A native compiler barrier for sure is a lot faster than this... */ #define PG_HAVE_COMPILER_BARRIER_EMULATION extern void pg_extern_compiler_barrier(void); #define pg_compiler_barrier_impl pg_extern_compiler_barrier #endif /* * If we have atomics implementation for this platform, fall back to providing * the atomics API using a spinlock to protect the internal state. Possibly * the spinlock implementation uses semaphores internally... * * We have to be a bit careful here, as it's not guaranteed that atomic * variables are mapped to the same address in every process (e.g. dynamic * shared memory segments). We can't just hash the address and use that to map * to a spinlock. Instead assign a spinlock on initialization of the atomic * variable. */ #if !defined(PG_HAVE_ATOMIC_FLAG_SUPPORT) && !defined(PG_HAVE_ATOMIC_U32_SUPPORT) #define PG_HAVE_ATOMIC_FLAG_SIMULATION #define PG_HAVE_ATOMIC_FLAG_SUPPORT typedef struct pg_atomic_flag { /* * To avoid circular includes we can't use s_lock as a type here. Instead * just reserve enough space for all spinlock types. Some platforms would * be content with just one byte instead of 4, but that's not too much * waste. */ #if defined(__hppa) || defined(__hppa__) /* HP PA-RISC, GCC and HP compilers */ int sema[4]; #else int sema; #endif volatile bool value; } pg_atomic_flag; #endif /* PG_HAVE_ATOMIC_FLAG_SUPPORT */ #if !defined(PG_HAVE_ATOMIC_U32_SUPPORT) #define PG_HAVE_ATOMIC_U32_SIMULATION #define PG_HAVE_ATOMIC_U32_SUPPORT typedef struct pg_atomic_uint32 { /* Check pg_atomic_flag's definition above for an explanation */ #if defined(__hppa) || defined(__hppa__) /* HP PA-RISC, GCC and HP compilers */ int sema[4]; #else int sema; #endif volatile uint32 value; } pg_atomic_uint32; #endif /* PG_HAVE_ATOMIC_U32_SUPPORT */ #ifdef PG_HAVE_ATOMIC_FLAG_SIMULATION #define PG_HAVE_ATOMIC_INIT_FLAG extern void pg_atomic_init_flag_impl(volatile pg_atomic_flag *ptr); #define PG_HAVE_ATOMIC_TEST_SET_FLAG extern bool pg_atomic_test_set_flag_impl(volatile pg_atomic_flag *ptr); #define PG_HAVE_ATOMIC_CLEAR_FLAG extern void pg_atomic_clear_flag_impl(volatile pg_atomic_flag *ptr); #define PG_HAVE_ATOMIC_UNLOCKED_TEST_FLAG extern bool pg_atomic_unlocked_test_flag_impl(volatile pg_atomic_flag *ptr); #endif /* PG_HAVE_ATOMIC_FLAG_SIMULATION */ #ifdef PG_HAVE_ATOMIC_U32_SIMULATION #define PG_HAVE_ATOMIC_INIT_U32 extern void pg_atomic_init_u32_impl(volatile pg_atomic_uint32 *ptr, uint32 val_); #define PG_HAVE_ATOMIC_WRITE_U32 extern void pg_atomic_write_u32_impl(volatile pg_atomic_uint32 *ptr, uint32 val); #define PG_HAVE_ATOMIC_COMPARE_EXCHANGE_U32 extern bool pg_atomic_compare_exchange_u32_impl(volatile pg_atomic_uint32 *ptr, uint32 *expected, uint32 newval); #define PG_HAVE_ATOMIC_FETCH_ADD_U32 extern uint32 pg_atomic_fetch_add_u32_impl(volatile pg_atomic_uint32 *ptr, int32 add_); #endif /* PG_HAVE_ATOMIC_U32_SIMULATION */
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