Changeset 566 for trunk/kernel/syscalls/sys_getpid.c

Timestamp:

Oct 4, 2018, 11:50:21 PM (6 years ago)

Author:

alain

Message:

Complete restructuration of kernel locks.

File:

• trunk/kernel/syscalls/sys_getpid.c (modified) (2 diffs)

trunk/kernel/syscalls/sys_getpid.c

@@ -1 +1 @@
 /*
- * kern/sys_getpid.c - get process id
+ * kern/sys_getpid.c - Kernel function implementing the "get_pid" system call.
  * 
- * Author     Alain Greiner  (2016,2017)
+ * Author     Alain Greiner  (2016,2017, 2018)
  *
  * Copyright (c) UPMC Sorbonne Universites
@@ -23 +23 @@
 
 #include <thread.h>
-
+#include <process.h>
 #include <syscalls.h>
 
-////////////////
+//////////////////////
 int sys_getpid( void )
 {
-        return CURRENT_THREAD->process->pid;
-}
+    thread_t  * this    = CURRENT_THREAD;
+    process_t * process = this->process;
+
+#if (DEBUG_SYS_GETPID || CONFIG_INSTRUMENTATION_SYSCALLS)
+uint64_t     tm_start = hal_get_cycles();
+#endif
+
+#if DEBUG_SYS_GETPID
+tm_start = hal_get_cycles();
+if( DEBUG_SYS_FG < tm_start )
+printk("\n[DBG] %s : thread %x in process %x enter / cycle %d\n",
+__FUNCTION__ , this->trdid , process->pid, (uint32_t)tm_start );
+#endif
+
+    // get pid value from local process descriptor    
+    pid_t pid = process->pid;
+
+#if (DEBUG_SYS_GETPID || CONFIG_INSTRUMENTATION_SYSCALLS)
+uint64_t     tm_end = hal_get_cycles();
+#endif
+
+#if DEBUG_SYS_GETPID
+tm_end = hal_get_cycles();
+if( DEBUG_SYS_GETPID < tm_end )
+printk("\n[DBG] %s : thread %x in process %x exit / cycle %d\n",
+__FUNCTION__, this->trdid, process->pid, (uint32_t)tm_end );
+#endif
+
+#if CONFIG_INSTRUMENTATION_SYSCALLS
+hal_atomic_add( &syscalls_cumul_cost[SYS_GETPID] , tm_end - tm_start );
+hal_atomic_add( &syscalls_occurences[SYS_GETPID] , 1 );
+#endif
+
+        return pid;
+
+}  // end sys_getpid()