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When used securely, the signal() method has better performance than signalAll().
When notify() or signal() is used to waken a waiting thread, and the thread is not prepared to resume execution, it often resumes waiting. Consequently, no thread wakens, which may cause the system to hang.
Noncompliant Code Example (notify())
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Notifying a single thread rather than all waiting threads can violate the liveness property of the system.
Rule | Severity | Likelihood | Remediation Cost | Priority | Level |
|---|---|---|---|---|---|
THI02-J | Low | Unlikely | Medium | P2 | L3 |
Automated Detection
| Tool | Version | Checker | Description |
|---|
FB.MT_CORRECTNESS.NO_NOTIFY_NOT_NOTIFYALL
Using notify() rather than notifyAll()
| Parasoft Jtest |
| CERT.THI02.ANF | Do not use 'notify()'; use 'notifyAll()' instead so that all waiting threads will be notified | ||||||
| SonarQube |
| S2446 | "notifyAll" should be used |
Related Guidelines
Bibliography
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