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Protect Ticker attach with a critical section 

Add a critical section to attach_us so setting _function and
locking deep sleep are done atomically.
pull/5220/head
Russ Butler 2017-09-28 16:36:15 -05:00
parent ea468856c4
commit 87b151c8a0
1 changed files with 3 additions and 0 deletions
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3
drivers/Ticker.h
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@ -22,6 +22,7 @@
#include "platform/NonCopyable.h" #include "platform/NonCopyable.h"
#include "platform/mbed_sleep.h" #include "platform/mbed_sleep.h"
#include "hal/lp_ticker_api.h" #include "hal/lp_ticker_api.h"
#include "platform/mbed_critical.h"
namespace mbed { namespace mbed {
/** \addtogroup drivers */ /** \addtogroup drivers */
@ -113,12 +114,14 @@ public:
* *
*/ */
void attach_us(Callback<void()> func, us_timestamp_t t) { void attach_us(Callback<void()> func, us_timestamp_t t) {
core_util_critical_section_enter();
// lock only for the initial callback setup and this is not low power ticker // lock only for the initial callback setup and this is not low power ticker
if(!_function && _lock_deepsleep) { if(!_function && _lock_deepsleep) {
sleep_manager_lock_deep_sleep(); sleep_manager_lock_deep_sleep();
} }
_function = func; _function = func;
setup(t); setup(t);
core_util_critical_section_exit();
} }
/** Attach a member function to be called by the Ticker, specifying the interval in micro-seconds /** Attach a member function to be called by the Ticker, specifying the interval in micro-seconds