Changeset 709 for soft/giet_vm/giet_kernel/switch.s

Timestamp:

Oct 1, 2015, 4:20:46 PM (9 years ago)

Author:

alain

Message:

Major release: Change the task model to implement the POSIX threads API.

• The shell "exec" and "kill" commands can be used to activate/de-activate the applications.
• The "pause", "resume", and "context" commands can be used to stop, restart, a single thtead or to display the thread context.

This version has been tested on the following multi-threaded applications,
that have been modified to use the POSIX threads:

• classif
• convol
• transpose
• gameoflife
• raycast

File:

• soft/giet_vm/giet_kernel/switch.s (modified) (4 diffs)

soft/giet_vm/giet_kernel/switch.s

@@ -1 +1 @@
 /******************************************************************************
-* This function receives two arguments that are the current task context 
-* (virtual) addresses and the next task context (virtual) address.
+* This function receives two arguments that are the current thread context 
+* (virtual) addresses and the next thread context (virtual) address.
 *
 * This function should be called in a critical section
@@ -15 +15 @@
 ******************************************************************************/
 
-    .globl  _task_switch
-    .func   _task_switch
-    .type   _task_switch, %function
+    .globl  _thread_switch
+    .func   _thread_switch
+    .type   _thread_switch, %function
 
-_task_switch:
+_thread_switch:
 
-    /* save _current task context */
-    add     $27,    $4,     $0  /* $27 <= &context[curr_task_id] */
+    /* first step : save current thread context */
+    add     $27,    $4,     $0  /* $27 <= &context[current] */
 
     .set noat
@@ -70 +70 @@
     sw      $26,    39*4($27)   /* ctx[35] <= PTPR */
 
-    /* restore next task context */
-    add     $27,    $5,     $0  /* $27<= &context[next_task_id] */
+    /* second step : restore next thread context */
+    add     $27,    $5,     $0  /* $27<= &context[next] */
 
     .set noat
@@ -123 +123 @@
 
     .endfunc
-    .size _task_switch, .-_task_switch
+    .size _thread_switch, .-_thread_switch