ipi finily work , delay 15us.. need code clean

testcase/userstack.c

@@ -1,12 +1,15 @@
 #include <stdio.h>
 // #include <libunwind.h>
-#include <unistd.h>
 #include <pthread.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+
 
 // void customFunction1(int n);
-void *customFunction1(void *n);
-void customFunction2(int n);
-void customFunction3(int n);
+// void *customFunction1(void *n);
+// void customFunction2(int n);
+// void customFunction3(int n);
 
 // Call this function to get a backtrace.
 // void backtrace() {
@@ -35,61 +38,79 @@ void customFunction3(int n);
 //   }
 // }
 
-void *customFunction1(void *n) {
-    int num = *((int *)n);
-    if(num <= 0) {
-        printf("End of recursion\n");
-        printf("pid: %d\n", getpid());
-        while (1) {
-            sleep(1);
-        } // never return, keep stack
-        // return NULL;
-    } else {
-        printf("Calling customFunction2\n");
-        customFunction2(num-1);
-    }
-    return NULL;
+pid_t gettid() {
+    return syscall(SYS_gettid);
+}
+
+static void additionalFunction(int n) {
+  printf("Additional function called with n = %d\n", n);
+}
+
+static void customFunction3(int n) {
+  printf("Calling customFunction3\n");
+  additionalFunction(n);
+  if (n <= 0) {
+    printf("End of recursion\n");
+    printf("pid: %d\n", getpid());
+    while (1) {
+      sleep(1);
+    } // never return, keep stack
+      // return NULL;
+  }
+  customFunction2(n - 1);
 }
 
 void customFunction2(int n) {
-    printf("Calling customFunction2\n");
-    if(n <= 0) {
-        printf("End of recursion\n");
-        printf("pid: %d\n", getpid());
-        while (1) {
-            sleep(1);
-        } // never return, keep stack
-        // return NULL;
-    }
-    customFunction3(n-1);
+  printf("Calling customFunction2\n");
+  additionalFunction(n);
+  if (n <= 0) {
+    printf("End of recursion\n");
+    printf("pid: %d\n", getpid());
+    while (1) {
+      sleep(1);
+    } // never return, keep stack
+      // return NULL;
+  }
+  customFunction3(n - 1);
 }
 
-void customFunction3(int n) {
-    printf("Calling customFunction3\n");
-    if(n <= 0) {
-        printf("End of recursion\n");
-        printf("pid: %d\n", getpid());
-        while (1) {
-            sleep(1);
-        } // never return, keep stack
-        // return NULL;
-    }
-    customFunction2(n-1);
+void *customFunction1(void *n) {
+  int num = *((int *)n);
+  if (num <= 0) {
+    printf("End of recursion\n");
+    printf("pid: %d\n", getpid());
+    while (1) {
+      sleep(1);
+    } // never return, keep stack
+      // return NULL;
+  } else {
+    printf("Calling customFunction2\n");
+    customFunction2(num - 1);
+  }
+  return NULL;
+}
+
+void *customFunction122(void *n) {
+  printf("tid: %d\n", gettid());
+  while (1)
+  {
+    /* code */
+  }
 }
 
 int main() {
-    int num1 = 4;
-    int num2 = 5;
-    int num3 = 6;
+  int num1 = 10;
+  int num2 = 11;
+  int num3 = 12;
 
-    pthread_t thread_id1, thread_id2, thread_id3;
+  pthread_t thread_id1, thread_id2, thread_id3;
 
-    pthread_create(&thread_id1, NULL, customFunction1, &num1);
-    pthread_create(&thread_id2, NULL, customFunction1, &num2);
-    pthread_create(&thread_id3, NULL, customFunction1, &num3);
+  pthread_create(&thread_id2, NULL, customFunction1, &num2);
+  pthread_create(&thread_id3, NULL, customFunction1, &num3);
+  pthread_create(&thread_id1, NULL, customFunction122, &num1);
 
-    pthread_join(thread_id1, NULL);
-    pthread_join(thread_id2, NULL);
-    pthread_join(thread_id3, NULL);
-    return 0;
+  pthread_join(thread_id1, NULL);
+  pthread_join(thread_id2, NULL);
+  pthread_join(thread_id3, NULL);
+  return 0;
 }