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| CodeSonar® 9.0p0 Hot Tips | CONFIDENTIAL | CodeSecure Inc |
A lock is acquired while another lock is held.
| Class Name | Nested Locks | ||||||
|---|---|---|---|---|---|---|---|
| Significance | style | ||||||
| Mnemonic | CONCURRENCY.LOCK.NESTED | ||||||
| Categories |
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| Availability | Available for C and C++. |
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| Enabling | Checks for this warning class are
disabled by default. To enable them, add the following WARNING_FILTER
rule to the project configuration file.
WARNING_FILTER += allow class="Nested Locks" |
Nested Locks warnings can be triggered by the following functions.
Japanese (ja)
#include <pthread.h>
pthread_mutex_t LockA;
pthread_mutex_t LockB;
void nested_locks(void){
pthread_mutex_lock(&LockA);
pthread_mutex_lock(&LockB); /* 'Nested Locks' warning issued here */
/* ... operate on locked data */
pthread_mutex_unlock(&LockB);
pthread_mutex_unlock(&LockA);
}
Deadlock cannot occur if no thread ever holds more than one lock at a time.
The following configuration file parameters affect checks for this warning class.