rtems/rtems-libbsd
1
0
Fork 0
mirror of https://git.rtems.org/rtems-libbsd/ synced 2025-07-02 11:51:02 +08:00
Code Issues Packages Projects Releases Wiki Activity

rtemsbsd/atomic: Return a value for CMPSET

Browse Source 
When the cmpset and fcmpset functions were refactored, the return value
of the operation was discarded instead of being returned for SMP builds
outside of gcc 4.x. This had the effect of turning these functions into
a long busywait loop that eventually failed due to integer overflow.

This patch restores the use of the return value of the atomic
operations.
This commit is contained in:
Kinsey Moore 2021-10-07 15:38:51 -05:00 committed by Joel Sherrill
parent 0baf1a8545
commit 38f3de6469
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
rtemsbsd/include/machine/atomic.h
View File

@ -530,7 +530,7 @@ atomic_clear_rel_long(volatile long *p, long v)
#elif defined(_RTEMS_BSD_MACHINE_ATOMIC_USE_STDATOMIC)
#define _ATOMIC_CMPSET(T, p, cmp, set, mo) \
atomic_##T *q = (atomic_##T *)RTEMS_DEVOLATILE(T *, p); \
atomic_compare_exchange_strong_explicit(q, &cmp, set, \
rv = atomic_compare_exchange_strong_explicit(q, &cmp, set, \
mo, memory_order_relaxed)
#else
#define _ATOMIC_CMPSET(T, p, cmp, set, mo) \
@ -676,7 +676,7 @@ atomic_cmpset_rel_ptr(volatile uintptr_t *p, uintptr_t cmp, uintptr_t set)
#elif defined(_RTEMS_BSD_MACHINE_ATOMIC_USE_STDATOMIC)
#define _ATOMIC_FCMPSET(T, p, cmp, set, mo) \
atomic_##T *q = (atomic_##T *)RTEMS_DEVOLATILE(T *, p); \
atomic_compare_exchange_strong_explicit(q, cmp, set, \
rv = atomic_compare_exchange_strong_explicit(q, cmp, set, \
mo, memory_order_relaxed)
#else
#define _ATOMIC_FCMPSET(T, p, cmp, set, mo) \