Eiger stop lock (#576)

* added a lock when stopping or starting state machine in eiger server

* added 5ms right after acq started to make sure it really started

* added 100ms right after acq started to make sure it really started

slsDetectorServers/eigerDetectorServer/slsDetectorFunctionList.c

@@ -2217,43 +2217,44 @@ int setTransmissionDelayRight(int value) {
 
 /* aquisition */
 
-int prepareAcquisition() {
-#ifndef VIRTUAL
-    sharedMemory_lockLocalLink();
-    LOG(logINFO, ("Going to prepare for acquisition with counter_bit:%d\n",
-                  Feb_Control_Get_Counter_Bit()));
-    Feb_Control_PrepareForAcquisition();
-    sharedMemory_unlockLocalLink();
-#endif
-    return OK;
-}
-
 int startStateMachine() {
+    sharedMemory_lockAcqFlag();
+
 #ifdef VIRTUAL
     // create udp socket
     if (createUDPSocket(0) != OK) {
+        sharedMemory_unlockAcqFlag();
         return FAIL;
     }
     if (createUDPSocket(1) != OK) {
+        sharedMemory_unlockAcqFlag();
         return FAIL;
     }
     LOG(logINFOBLUE, ("Starting State Machine\n"));
     if (sharedMemory_getStop() != 0) {
         LOG(logERROR, ("Cant start acquisition. "
                        "Stop server has not updated stop status to 0\n"));
+        sharedMemory_unlockAcqFlag();
         return FAIL;
     }
     sharedMemory_setStatus(RUNNING);
     if (pthread_create(&virtual_tid, NULL, &start_timer, NULL)) {
         LOG(logERROR, ("Could not start Virtual acquisition thread\n"));
         sharedMemory_setStatus(IDLE);
+        sharedMemory_unlockAcqFlag();
         return FAIL;
     }
     LOG(logINFO, ("Virtual Acquisition started\n"));
+    sharedMemory_unlockAcqFlag();
     return OK;
 #else
     sharedMemory_lockLocalLink();
-    LOG(logINFO, ("Acquisition started bit toggled\n"));
+
+    LOG(logINFO, ("Going to prepare for acquisition with counter_bit:%d\n",
+                  Feb_Control_Get_Counter_Bit()));
+    Feb_Control_PrepareForAcquisition();
+
+
     int ret = OK, prev_flag;
     // get the DAQ toggle bit
     prev_flag = Feb_Control_AcquisitionStartedBit();
@@ -2270,12 +2271,14 @@ int startStateMachine() {
             LOG(logERROR,
                 ("Acquisition did not LOG(logERROR ouble reading register\n"));
             sharedMemory_unlockLocalLink();
+            sharedMemory_unlockAcqFlag();
             return FAIL;
         }
+	usleep(100 * 1000);
         LOG(logINFOGREEN, ("Acquisition started\n"));
     }
     sharedMemory_unlockLocalLink();
-
+    sharedMemory_unlockAcqFlag();
     return ret;
 #endif
 }
@@ -2508,6 +2511,10 @@ void *start_timer(void *arg) {
 #endif
 
 int stopStateMachine() {
+    
+    // acq lock for seamless stop
+    sharedMemory_lockAcqFlag();
+
     LOG(logINFORED, ("Stopping state machine\n"));
     // if scan active, stop scan
     if (sharedMemory_getScanStatus() == RUNNING) {
@@ -2520,6 +2527,7 @@ int stopStateMachine() {
         usleep(500);
     sharedMemory_setStop(0);
     LOG(logINFO, ("Stopped State Machine\n"));
+    sharedMemory_unlockAcqFlag();
     return OK;
 #else
     sharedMemory_lockLocalLink();
@@ -2527,6 +2535,7 @@ int stopStateMachine() {
     if (!Feb_Control_StopAcquisition()) {
         LOG(logERROR, ("failed to stop acquisition\n"));
         sharedMemory_unlockLocalLink();
+        sharedMemory_unlockAcqFlag();
         return FAIL;
     }
     sharedMemory_unlockLocalLink();
@@ -2537,6 +2546,7 @@ int stopStateMachine() {
         // wait for beb to send out all packets
         if (Beb_IsTransmitting(&isTransmitting, send_to_ten_gig, 1) == FAIL) {
             LOG(logERROR, ("failed to stop beb acquisition\n"));
+            sharedMemory_unlockAcqFlag();
             return FAIL;
         }
         if (isTransmitting) {
@@ -2547,11 +2557,11 @@ int stopStateMachine() {
 
     // reset feb and beb
     sharedMemory_lockLocalLink();
-    // uncommenting this out as it randomly does not set the processing bit to high
+    Feb_Control_Reset();
-    //Feb_Control_Reset();
     sharedMemory_unlockLocalLink();
     if (!Beb_StopAcquisition()) {
         LOG(logERROR, ("failed to stop acquisition\n"));
+        sharedMemory_unlockAcqFlag();
         return FAIL;
     }
 
@@ -2561,6 +2571,7 @@ int stopStateMachine() {
         Beb_SetNextFrameNumber(retval + 1);
     }
     LOG(logINFOBLUE, ("Stopping state machine complete\n\n"));
+    sharedMemory_unlockAcqFlag();
     return OK;
 #endif
 }

slsDetectorServers/slsDetectorServer/include/sharedMemory.h

@@ -25,4 +25,6 @@ int sharedMemory_getScanStop();
 #ifdef EIGERD
 void sharedMemory_lockLocalLink();
 void sharedMemory_unlockLocalLink();
+void sharedMemory_lockAcqFlag();
+void sharedMemory_unlockAcqFlag();
 #endif

slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h

@@ -600,9 +600,6 @@ int setTransmissionDelayRight(int value);
 #endif
 
 // aquisition
-#ifdef EIGERD
-int prepareAcquisition();
-#endif
 int startStateMachine();
 #ifdef VIRTUAL
 void *start_timer(void *arg);

slsDetectorServers/slsDetectorServer/src/sharedMemory.c

@@ -20,6 +20,7 @@ typedef struct Memory {
     pthread_mutex_t lockStatus;
 #ifdef EIGERD
     pthread_mutex_t lockLocalLink;
+    pthread_mutex_t lockAcqFlag;
 #endif
     enum runStatus scanStatus; // idle, running or error
     int scanStop;
@@ -120,6 +121,7 @@ int sharedMemory_initialize() {
 #endif
 
 #ifdef EIGERD
+    // local link mutex
     pthread_mutexattr_t lockLocalLinkAttribute;
     if (pthread_mutexattr_init(&lockLocalLinkAttribute) != 0) {
         LOG(logERROR,
@@ -141,6 +143,28 @@ int sharedMemory_initialize() {
                        "shared memory\n"));
         return FAIL;
     }
+    // acq flag mutex
+    pthread_mutexattr_t lockAcqFlagAttribute;
+    if (pthread_mutexattr_init(&lockAcqFlagAttribute) != 0) {
+        LOG(logERROR,
+            ("Failed to initialize mutex attribute for lockAcqFlag for "
+             "shared memory\n"));
+        return FAIL;
+    }
+
+    if (pthread_mutexattr_setpshared(&lockAcqFlagAttribute,
+                                     PTHREAD_PROCESS_SHARED) != 0) {
+        LOG(logERROR, ("Failed to set attribute property to process shared for "
+                       "lockAcqFlag for shared memory\n"));
+        return FAIL;
+    }
+
+    if (pthread_mutex_init(&(shm->lockAcqFlag), &lockAcqFlagAttribute) !=
+        0) {
+        LOG(logERROR, ("Failed to initialize pthread_mutex_t lockAcqFlag for "
+                       "shared memory\n"));
+        return FAIL;
+    }
 #endif
     shm->scanStatus = IDLE;
     shm->scanStop = 0;
@@ -266,4 +290,10 @@ void sharedMemory_lockLocalLink() { pthread_mutex_lock(&(shm->lockLocalLink)); }
 void sharedMemory_unlockLocalLink() {
     pthread_mutex_unlock(&(shm->lockLocalLink));
 }
+
+void sharedMemory_lockAcqFlag() { pthread_mutex_lock(&(shm->lockAcqFlag)); }
+
+void sharedMemory_unlockAcqFlag() {
+    pthread_mutex_unlock(&(shm->lockAcqFlag));
+}
 #endif

slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c

@@ -1909,9 +1909,6 @@ void *start_state_machine(void *arg) {
             }
             usleep(scanSettleTime_ns / 1000);
         }
-#ifdef EIGERD
-        prepareAcquisition();
-#endif
         ret = startStateMachine();
         LOG(logDEBUG2, ("Starting Acquisition ret: %d\n", ret));
         if (ret == FAIL) {