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Merge pull request #2929 from ARMmbed/update_trace 

Update trace
pull/2963/head
Martin Kojtal 2016-10-07 10:37:25 +01:00 committed by GitHub
parent 94e1cbccfc 35c4ceb2ef
commit 49145358ec
1 changed files with 13 additions and 3 deletions
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16
features/FEATURE_COMMON_PAL/mbed-trace/source/mbed_trace.c
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@ -454,10 +454,20 @@ void mbed_vtracef(uint8_t dlevel, const char* grp, const char *fmt, va_list ap)
end:
if ( m_trace.mutex_release_f ) {
while (m_trace.mutex_lock_count > 0) {
m_trace.mutex_lock_count--;
// Store the mutex lock count to temp variable so that it won't get
// clobbered during last loop iteration when mutex gets released
int count = m_trace.mutex_lock_count;
m_trace.mutex_lock_count = 0;
// Since the helper functions (eg. mbed_trace_array) are used like this:
// mbed_tracef(TRACE_LEVEL_INFO, "grp", "%s", mbed_trace_array(some_array))
// The helper function MUST acquire the mutex if it modifies any buffers. However
// it CANNOT unlock the mutex because that would allow another thread to acquire
// the mutex after helper function unlocks it and before mbed_tracef acquires it
// for itself. This means that here we have to unlock the mutex as many times
// as it was acquired by trace function and any possible helper functions.
do {
m_trace.mutex_release_f();
}
} while (--count > 0);
}
}
static void mbed_trace_reset_tmp(void)