diff options
Diffstat (limited to 'include/atomic.h')
| -rw-r--r-- | include/atomic.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/include/atomic.h b/include/atomic.h index 8feb65250..ef487b4ab 100644 --- a/include/atomic.h +++ b/include/atomic.h @@ -33,6 +33,14 @@ * This file implements atomic functions by disabling interrupts globally. * Implementations with architecture specific atomic instructions can be * provided under each compiler directory. + * + * The atomic interface can be used in FreeRTOS tasks on all FreeRTOS ports. It + * can also be used in Interrupt Service Routines (ISRs) on FreeRTOS ports that + * support nested interrupts (i.e. portHAS_NESTED_INTERRUPTS is set to 1). The + * atomic interface must not be used in ISRs on FreeRTOS ports that do not + * support nested interrupts (i.e. portHAS_NESTED_INTERRUPTS is set to 0) + * because ISRs on these ports cannot be interrupted and therefore, do not need + * atomics in ISRs. */ #ifndef ATOMIC_H @@ -59,7 +67,7 @@ * ATOMIC_ENTER_CRITICAL(). * */ -#if defined( portSET_INTERRUPT_MASK_FROM_ISR ) +#if ( portHAS_NESTED_INTERRUPTS == 1 ) /* Nested interrupt scheme is supported in this port. */ #define ATOMIC_ENTER_CRITICAL() \ |