Asynchronous interrupts

If an asynchronous signal is being delivered to a thread running with POSIX(ON), the thread is interrupted for the signal only when the execution is:
  • In a user C routine, or in a user COBOL routine compiled with the THREAD compiler option
  • Just before a return to a C routine or to a return to a user COBOL routine compiled with the THREAD compiler option
  • Just before an invocation of a Language Environment library from a user routine

C routines or COBOL routines compiled with the THREAD compiler option may need to protect against asynchronous signals based on the application logic including the possible use of the POSIX signal-blocking function that is available.

Parent topic: Considerations for coding or running assembler routines