| Table 3: POSIX in commercial operating systems |
| OS |
POSIX 1003.1a
(Base POSIX) |
POSIX 1003.1b
(Real-time extensions) |
POSIX 1003.1c
(Threads) |
| Solaris |
Full support |
Full support |
Full support |
| LynxOS |
Conformant |
Full support |
3.0.1 based on draft and missing thread attributes; 3.1 based on final standard |
| VxWorks |
Partial support; support for functions that do not require a process model |
Partial support; support for functions that do not require a process model |
Support through a third party product |
| IRIX |
Conformant |
Full support |
Full support |
| Linux |
Full support |
Partial support; no support for timers or message queues |
Full support |
| QNX Neutrino |
Full support |
Close to full support; no support for memory locking |
Full support |
