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| ID | Category | Severity | Type | Date Submitted | Last Update | ||
| 0000858 | [1003.1(2013)/Issue7+TC1] System Interfaces | Comment | Clarification Requested | 2014-07-11 14:31 | 2019-06-10 08:54 | ||
| Reporter | geoffclare | View Status | public | ||||
| Assigned To | |||||||
| Priority | normal | Resolution | Accepted | ||||
| Status | Closed | ||||||
| Name | Geoff Clare | ||||||
| Organization | The Open Group | ||||||
| User Reference | |||||||
| Section | pthread_atfork() | ||||||
| Page Number | 1543 | ||||||
| Line Number | 50230,50244 | ||||||
| Interp Status | --- | ||||||
| Final Accepted Text | |||||||
| Summary | 0000858: highlight the dangers of using pthread_atfork() | ||||||
| Description |
A separate bug is needed for the changes proposed in Note: 0002287 since these are suitable for TC2 but the changes to address 0000851 will need to wait for Issue 8. The aim here is make the warnings of the dangers of using pthread_atfork() (which are currently buried in the RATIONALE) more prominent for the benefit of application writers. |
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| Desired Action |
After page 1543 line 50230 add a new paragraph: If a fork() call in a multi-threaded process leads to a child fork handler calling any function that is not async-signal-safe, the behavior is undefined. On page 1543 line 50244 change the APPLICATION USAGE section from: None. to: The original usage pattern envisaged for pthread_atfork() was for the prepare fork handler to lock mutexes and other locks, and for the parent and child handlers to unlock them. However, since all of the relevant unlocking functions, except sem_post(), are not async-signal-safe this usage results in undefined behavior in the child process unless the only such unlocking function it calls is sem_post(). On page 1545 line 50308 change the FUTURE DIRECTIONS section from: None. to: The pthread_atfork() function may be formally deprecated (for example by shading it OB) in a future revision of this standard. On page 889 line 29741 section fork() delete: Fork handlers may be established by means of the pthread_atfork() function in order to maintain application invariants across fork() calls. |
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| Tags | tc2-2008 | ||||||
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Issue History |
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| Date Modified | Username | Field | Change |
| 2014-07-11 14:31 | geoffclare | New Issue | |
| 2014-07-11 14:31 | geoffclare | Name | => Geoff Clare |
| 2014-07-11 14:31 | geoffclare | Organization | => The Open Group |
| 2014-07-11 14:31 | geoffclare | Section | => pthread_atfork() |
| 2014-07-11 14:31 | geoffclare | Page Number | => 1543 |
| 2014-07-11 14:31 | geoffclare | Line Number | => 50230,50244 |
| 2014-07-11 14:31 | geoffclare | Interp Status | => --- |
| 2014-07-17 16:27 | Don Cragun | Status | New => Resolved |
| 2014-07-17 16:27 | Don Cragun | Resolution | Open => Accepted |
| 2014-07-17 16:27 | Don Cragun | Tag Attached: tc2-2008 | |
| 2019-06-10 08:54 | agadmin | Status | Resolved => Closed |
| 2022-07-28 15:54 | eblake | Relationship added | related to 0000851 |
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