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Add missing retry to atomic exchange 

Atomic exchange implementation forgot to do the retry if the exclusive
store failed.
pull/14001/head
Kevin Bracey 2020-12-03 16:23:33 +02:00
parent d2adc9ef78
commit 0b30742c80
1 changed files with 6 additions and 2 deletions
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4
platform/include/platform/internal/mbed_atomic_impl.h
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@ -346,7 +346,9 @@ inline T core_util_atomic_exchange_##fn_suffix(volatile T *valuePtr, T newValue)
T oldValue; \ T oldValue; \
uint32_t fail; \ uint32_t fail; \
MBED_BARRIER(); \ MBED_BARRIER(); \
do { \
DO_MBED_LOCKFREE_EXCHG_ASM(M); \ DO_MBED_LOCKFREE_EXCHG_ASM(M); \
} while (fail); \
MBED_BARRIER(); \ MBED_BARRIER(); \
return oldValue; \ return oldValue; \
} \ } \
@ -357,7 +359,9 @@ MBED_FORCEINLINE T core_util_atomic_exchange_explicit_##fn_suffix(
T oldValue; \ T oldValue; \
uint32_t fail; \ uint32_t fail; \
MBED_RELEASE_BARRIER(order); \ MBED_RELEASE_BARRIER(order); \
do { \
DO_MBED_LOCKFREE_EXCHG_ASM(M); \ DO_MBED_LOCKFREE_EXCHG_ASM(M); \
} while (fail); \
MBED_ACQUIRE_BARRIER(order); \ MBED_ACQUIRE_BARRIER(order); \
return oldValue; \ return oldValue; \
} }