add TRACE p-server

.vscode/settings.json

@@ -4,6 +4,7 @@
     ],
     "files.associations": {
         "socket_wrapper.h": "c",
-        "stdalign.h": "c"
+        "stdalign.h": "c",
+        "timerhelper.h": "c"
     }
 }

p-server.c

@@ -13,6 +13,7 @@
 #include <assert.h>
 #include <fcntl.h>
 #include <sys/wait.h>
+
 #include "socket_wrapper.h"
 
 #ifndef DEFAULT_MAX_LISTEN_SOCKET
@@ -51,6 +52,15 @@ static const int RESPONSE_REQUEST = 3;
 static const int RESPONSE_REQUEST = DEFAULT_RESPONSE_REQUEST;
 #endif
 
+#define USE_TRACE
+
+#include <sys/time.h>
+#include <time.h>
+#include "timerhelper.h"
+enum{
+    Trace_Timer_ID = CLOCK_REALTIME
+};
+
 /*========
  *Operation
  *========*/
@@ -276,15 +286,22 @@ int main(int argc, const char *argv[]){
         char ip_buf[INET_ADDRSTRLEN];
         const char * msg;
         int retval = 0;
+        struct timespec ts,tsmiddle,tsend;
         if((csock = accept(sock, (struct sockaddr *)&client_addr,&client_addr_len)) < 0){
             free(buf);
             perror("accept error");
             return 1;
         }
         msg = inet_ntop(AF_INET,&client_addr.sin_addr,ip_buf,sizeof(ip_buf));
+    #ifdef USE_TRACE
+        clock_gettime(Trace_Timer_ID,&ts);
+    #endif
         fprintf(stderr,"Connected on : %s:%d\n",msg == NULL ? "(null)" : msg , ntohs(client_addr.sin_port));
         pid = fork();
         if(pid == 0){
+    #ifdef USE_TRACE
+            clock_gettime(Trace_Timer_ID,&tsmiddle);
+    #endif
             if((fd = read_request(csock,buf,bufsize)) > 0){
                 retval = send_response(csock,fd,buf,bufsize);
                 close(fd);
@@ -292,6 +309,14 @@ int main(int argc, const char *argv[]){
             else retval = fd;
             if(close(csock) < 0)
                 perror("csock close error");
+    #ifdef USE_TRACE
+            clock_gettime(Trace_Timer_ID,&tsend);
+            struct timespec tophalf = timespec_sub(tsmiddle,ts);
+            struct timespec bottomhelf = timespec_sub(tsend,tsmiddle);
+            struct timespec resolution;
+            clock_getres(Trace_Timer_ID,&resolution);
+            fprintf(stderr,"top: %ld ns, bottom: %ld ns, res: %ld\n",tophalf.tv_nsec,bottomhelf.tv_nsec,resolution.tv_nsec);
+    #endif
             free(buf);
             return retval;
         }

server.c

@@ -237,7 +237,7 @@ int parse_args(int argc,const char * argv[] , in_port_t * port){
 //============
 #ifdef USE_TRACE
 enum{
-    Trace_Timer_ID = CLOCK_PROCESS_CPUTIME_ID
+    Trace_Timer_ID = CLOCK_REALTIME
 };
 #endif