107 lines
2.5 KiB
C
107 lines
2.5 KiB
C
/*-------------------------------------------------------------------------
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*
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* generic-sunpro.h
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* Atomic operations for solaris' CC
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*
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* Portions Copyright (c) 2013-2023, PostgreSQL Global Development Group
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*
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* NOTES:
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*
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* Documentation:
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* * manpage for atomic_cas(3C)
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* http://www.unix.com/man-page/opensolaris/3c/atomic_cas/
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* http://docs.oracle.com/cd/E23824_01/html/821-1465/atomic-cas-3c.html
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*
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* src/include/port/atomics/generic-sunpro.h
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*
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* -------------------------------------------------------------------------
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*/
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#if defined(HAVE_ATOMICS)
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#ifdef HAVE_MBARRIER_H
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#include <mbarrier.h>
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#define pg_compiler_barrier_impl() __compiler_barrier()
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#ifndef pg_memory_barrier_impl
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/*
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* Despite the name this is actually a full barrier. Expanding to mfence/
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* membar #StoreStore | #LoadStore | #StoreLoad | #LoadLoad on x86/sparc
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* respectively.
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*/
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# define pg_memory_barrier_impl() __machine_rw_barrier()
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#endif
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#ifndef pg_read_barrier_impl
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# define pg_read_barrier_impl() __machine_r_barrier()
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#endif
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#ifndef pg_write_barrier_impl
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# define pg_write_barrier_impl() __machine_w_barrier()
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#endif
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#endif /* HAVE_MBARRIER_H */
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/* Older versions of the compiler don't have atomic.h... */
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#ifdef HAVE_ATOMIC_H
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#include <atomic.h>
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#define PG_HAVE_ATOMIC_U32_SUPPORT
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typedef struct pg_atomic_uint32
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{
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volatile uint32 value;
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} pg_atomic_uint32;
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#define PG_HAVE_ATOMIC_U64_SUPPORT
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typedef struct pg_atomic_uint64
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{
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/*
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* Syntax to enforce variable alignment should be supported by versions
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* supporting atomic.h, but it's hard to find accurate documentation. If
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* it proves to be a problem, we'll have to add more version checks for 64
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* bit support.
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*/
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volatile uint64 value pg_attribute_aligned(8);
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} pg_atomic_uint64;
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#endif /* HAVE_ATOMIC_H */
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#endif /* defined(HAVE_ATOMICS) */
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#if defined(HAVE_ATOMICS)
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#ifdef HAVE_ATOMIC_H
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#define PG_HAVE_ATOMIC_COMPARE_EXCHANGE_U32
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static inline bool
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pg_atomic_compare_exchange_u32_impl(volatile pg_atomic_uint32 *ptr,
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uint32 *expected, uint32 newval)
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{
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bool ret;
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uint32 current;
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current = atomic_cas_32(&ptr->value, *expected, newval);
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ret = current == *expected;
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*expected = current;
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return ret;
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}
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#define PG_HAVE_ATOMIC_COMPARE_EXCHANGE_U64
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static inline bool
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pg_atomic_compare_exchange_u64_impl(volatile pg_atomic_uint64 *ptr,
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uint64 *expected, uint64 newval)
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{
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bool ret;
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uint64 current;
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current = atomic_cas_64(&ptr->value, *expected, newval);
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ret = current == *expected;
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*expected = current;
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return ret;
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}
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#endif /* HAVE_ATOMIC_H */
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#endif /* defined(HAVE_ATOMICS) */
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