database/postgres
database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-05-02 11:44:50 +03:00
Code

Add RISC-V spinlock support in s_lock.h.

Browse Source 
Like the ARM case, just use gcc's __sync_lock_test_and_set();
that will compile into AMOSWAP.W.AQ which does what we need.

At some point it might be worth doing some work on atomic ops
for RISC-V, but this should be enough for a creditable port.

Back-patch to all supported branches, just in case somebody
wants to try them on RISC-V.

Marek Szuba

Discussion: https://postgr.es/m/dea97b6d-f55f-1f6d-9109-504aa7dfa421@gentoo.org
This commit is contained in:
Tom Lane 2021-08-13 13:58:47 -04:00
parent 75d8fe8181
commit cdda2b247d
1 changed files with 24 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
src/include/storage/s_lock.h
View File

@ -314,6 +314,7 @@ tas(volatile slock_t *lock)
#endif /* __INTEL_COMPILER */ #endif /* __INTEL_COMPILER */
#endif /* __ia64__ || __ia64 */ #endif /* __ia64__ || __ia64 */
/* /*
* On ARM and ARM64, we use __sync_lock_test_and_set(int *, int) if available. * On ARM and ARM64, we use __sync_lock_test_and_set(int *, int) if available.
* *
@ -340,6 +341,29 @@ tas(volatile slock_t *lock)
#endif /* __arm__ || __arm || __aarch64__ || __aarch64 */ #endif /* __arm__ || __arm || __aarch64__ || __aarch64 */
/*
* RISC-V likewise uses __sync_lock_test_and_set(int *, int) if available.
*/
#if defined(__riscv)
#ifdef HAVE_GCC__SYNC_INT32_TAS
#define HAS_TEST_AND_SET
#define TAS(lock) tas(lock)
typedef int slock_t;
static __inline__ int
tas(volatile slock_t *lock)
{
return __sync_lock_test_and_set(lock, 1);
}
#define S_UNLOCK(lock) __sync_lock_release(lock)
#endif /* HAVE_GCC__SYNC_INT32_TAS */
#endif /* __riscv */
/* S/390 and S/390x Linux (32- and 64-bit zSeries) */ /* S/390 and S/390x Linux (32- and 64-bit zSeries) */
#if defined(__s390__) || defined(__s390x__) #if defined(__s390__) || defined(__s390x__)
#define HAS_TEST_AND_SET #define HAS_TEST_AND_SET