Changes between Version 75 and Version 76 of processus_thread

Timestamp:

Feb 12, 2018, 11:58:33 AM (6 years ago)

Author:

alain

Comment:

--

processus_thread

@@ -159 +159 @@
 But the reference process destruction is more complex, because the child process destruction must be reported to the parent process when the parent process executes the blocking sys_wait() system call. Therefore, the child process destruction cannot be done before the parent calls the sys_wait() function. As the '''sys_wait()''' function, and the '''sys_kill() / sys_exit()''' function are executed by different threads running in different clusters, this requires a parent/child synchronization.
  
-After a sys-kill() or sys_exit(), all child process threads and all process copies are immediately destroyed, but the reference child process must be kept in ''zombi'' state if the sys_wait() syscall has not been executed.  The synchronization uses three specific flags in the reference child process descriptor : the PROCESS_FLAG_KILL flag indicates that a ''kill'' request has been received by the child;  the PROCESS_FLAG_EXIT flag indicates that an ''exit'' request has been received by the child;  the PROCESS_FLAG_WAIT flag indicates that a ''wait''  request has been received.  Moreover the sys_exit() argument of is registered in the ''exit_status'' field of the process descriptor.
+After a sys-kill() or sys_exit(), all child process threads and all process copies are immediately destroyed, but the reference child process must be kept in ''zombi'' state if the sys_wait() syscall has not been executed.  The synchronization uses the '''term_state'''  field in the reference child process descriptor : 
+ * the PROCESS_FLAG_KILL flag indicates that a KILL request has been received by the child;  
+ * the PROCESS_FLAG_EXIT flag indicates that an EXIT  request has been made by the child;  
+ * the PROCESS_FLAG_BLOCK flag indicates that a SIGSTOP signal has been received by the child; 
+ * the PROCESS_FLAG_WAIT flag indicates that a WAIT  request from parent has been received by the chid and reported to parent.
+ * moreover the sys_exit() argument  is registered in the ''term_state'' field of the process descriptor.
 
 The actual deletion of the reference process is always caused by the sys_wait() function, using generally a RPC: