[mc] Remote support for MC_deadlock_check() using MC_MESSAGE_DEADLOCK_CHECK IPC message

[simgrid.git] / src / mc / mc_client.c

diff --git a/src/mc/mc_client.c b/src/mc/mc_client.c
index 2f30581..da8d8c4 100644 (file)
--- a/src/mc/mc_client.c
+++ b/src/mc/mc_client.c
@@ -13,23 +13,28 @@
 
 #include <xbt/log.h>
 #include <xbt/sysdep.h>
+#include <xbt/mmalloc.h>
 
 #include "mc_protocol.h"
 #include "mc_client.h"
 
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_client, mc, "MC client logic");
+// We won't need those once the separation MCer/MCed is complete:
+#include "mc_mmalloc.h"
+#include "mc_ignore.h"
+#include "mc_model_checker.h"
+#include "mc_private.h" // MC_deadlock_check()
 
-typedef struct s_mc_client {
-  int active;
-  int fd;
-} s_mc_client_t, mc_client_t;
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_client, mc, "MC client logic");
 
-static s_mc_client_t mc_client;
+mc_client_t mc_client;
 
 void MC_client_init(void)
 {
-  mc_client.fd = -1;
-  mc_client.active = 1;
+  if (mc_client) {
+    XBT_WARN("MC_client_init called more than once.");
+    return;
+  }
+
   char* fd_env = getenv(MC_ENV_SOCKET_FD);
   if (!fd_env)
     xbt_die("MC socket not found");
@@ -40,34 +45,62 @@ void MC_client_init(void)
   int type;
   socklen_t socklen = sizeof(type);
   if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &type, &socklen) != 0)
-    xbt_die("Could not check socket type: %s", strerror(errno));
+    xbt_die("Could not check socket type");
   if (type != SOCK_DGRAM)
     xbt_die("Unexpected socket type %i", type);
   XBT_DEBUG("Model-checked application found expected socket type");
 
-  mc_client.fd = fd;
+  mc_client = xbt_new0(s_mc_client_t, 1);
+  mc_client->fd = fd;
+  mc_client->active = 1;
 }
 
 void MC_client_hello(void)
 {
   XBT_DEBUG("Greeting the MC server");
-  if (MC_protocol_hello(mc_client.fd) != 0)
+  if (MC_protocol_hello(mc_client->fd) != 0)
     xbt_die("Could not say hello the MC server");
   XBT_DEBUG("Greeted the MC server");
 }
 
+void MC_client_send_message(void* message, size_t size)
+{
+  if (MC_protocol_send(mc_client->fd, message, size))
+    xbt_die("Could not send message %i", (int) ((mc_message_t)message)->type);
+}
+
 void MC_client_handle_messages(void)
 {
   while (1) {
     XBT_DEBUG("Waiting messages from model-checker");
-    s_mc_message_t message;
-    if (recv(mc_client.fd, &message, sizeof(message), 0) == -1)
+
+    char message_buffer[MC_MESSAGE_LENGTH];
+    size_t s;
+    if ((s = recv(mc_client->fd, &message_buffer, sizeof(message_buffer), 0)) == -1)
       xbt_die("Could not receive commands from the model-checker: %s",
         strerror(errno));
+
     XBT_DEBUG("Receive message from model-checker");
+    s_mc_message_t message;
+    if (s < sizeof(message))
+      xbt_die("Message is too short");
+    memcpy(&message, message_buffer, sizeof(message));
     switch (message.type) {
+
+    case MC_MESSAGE_DEADLOCK_CHECK:
+      {
+        int result = MC_deadlock_check();
+        s_mc_int_message_t answer;
+        answer.type = MC_MESSAGE_DEADLOCK_CHECK_REPLY;
+        answer.value = result;
+        if (MC_protocol_send(mc_client->fd, &answer, sizeof(answer)))
+          xbt_die("Could nor send response");
+      }
+      break;
+
     case MC_MESSAGE_CONTINUE:
       return;
+
     default:
       xbt_die("Unexpected message from model-checker %i", message.type);
     }