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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2021-08-13 13:58:47 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2021-08-13 13:59:43 -0400 |
| commit | c32fcac56a212b4e6bb5ba63596f60a25a18109a (patch) | |
| tree | 5530de3671feeb1ddeba4e67a211bf5f4cd97f5c /src | |
| parent | 4279e5bc8c0b3a0cb6b6d3f1316ae81cd0028447 (diff) | |
| download | postgresql-c32fcac56a212b4e6bb5ba63596f60a25a18109a.tar.gz postgresql-c32fcac56a212b4e6bb5ba63596f60a25a18109a.zip | |
Add RISC-V spinlock support in s_lock.h.
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
Diffstat (limited to 'src')
| -rw-r--r-- | src/include/storage/s_lock.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/include/storage/s_lock.h b/src/include/storage/s_lock.h index 254c40d4779..dccbd299ced 100644 --- a/src/include/storage/s_lock.h +++ b/src/include/storage/s_lock.h @@ -314,6 +314,7 @@ tas(volatile slock_t *lock) #endif /* __INTEL_COMPILER */ #endif /* __ia64__ || __ia64 */ + /* * 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 */ +/* + * 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) */ #if defined(__s390__) || defined(__s390x__) #define HAS_TEST_AND_SET |