Changeset 670 for trunk/kernel/syscalls/sys_fork.c

Timestamp:

Nov 19, 2020, 11:45:52 PM (2 years ago)

Author:

alain

Message:

1) Introduce up to 4 command lines arguments in the KSH "load" command.
These arguments are transfered to the user process through the
argc/argv mechanism, using the user space "args" vseg.

2) Introduce the named and anonymous "pipes", for inter-process communication
through the pipe() and mkfifo() syscalls.

3) Introduce the "chat" application to validate the two above mechanisms.

4) Improve printk() and assert() fonctions in printk.c.

File:

• trunk/kernel/syscalls/sys_fork.c (modified) (6 diffs)

trunk/kernel/syscalls/sys_fork.c

@@ -2 +2 @@
  * sys_fork.c - Kernel function implementing the "fork" system call.
  * 
- * Authors  Alain Greiner  (2016,2017,2018,2019)
+ * Authors  Alain Greiner  (2016,2017,2018,2019,2020)
  *
  * Copyright (c) UPMC Sorbonne Universites
@@ -46 +46 @@
     xptr_t            parent_thread_xp;     // extended pointer on parent thread descriptor
     pid_t             parent_pid;           // parent process identifier
-    thread_t        * parent_thread_ptr;    // local pointer on local parent thread descriptor
+    thread_t        * parent_thread_ptr;    // local pointer on local parent thread
     cxy_t             parent_cxy;           // parent thread cluster
 
     pid_t             child_pid;            // child process identifier
-    thread_t        * child_thread_ptr;     // local pointer on remote child thread descriptor
+    thread_t        * child_thread_ptr;     // local pointer on remote child thread 
     cxy_t             child_cxy;            // target cluster for forked child process 
  
@@ -58 +58 @@
 
         error_t           error;
-    
 
     // get pointers on local parent process and thread
@@ -67 +66 @@
     parent_cxy         = local_cxy;
 
-#if (DEBUG_SYS_FORK || CONFIG_INSTRUMENTATION_SYSCALLS)
+#if DEBUG_SYS_FORK || DEBUG_SYSCALLS_ERROR || CONFIG_INSTRUMENTATION_SYSCALLS
 uint64_t     tm_start = hal_get_cycles();
 #endif
@@ -88 +87 @@
 
 #if DEBUG_SYSCALLS_ERROR
-printk("\n[ERROR] in %s : thread[%x,%x] cannot fork : too much children\n",
+if( DEBUG_SYSCALLS_ERROR < (uint32_t)tm_start )
+printk("\n[ERROR] in %s : thread[%x,%x] / too much children\n",
 __FUNCTION__, parent_pid, parent_thread_ptr->trdid );
 #endif
@@ -136 +136 @@
 
 #if DEBUG_SYSCALLS_ERROR
+if( DEBUG_SYSCALLS_ERROR < (uint32_t)tm_start )
 printk("\n[ERROR] in %s : thread[%x,%x] cannot fork\n",
 __FUNCTION__, parent_pid, parent_thread_ptr->trdid );