Add unit testcase for thread-pool.

Extract thread-pool into a separate CMake library.
Extract utils into a separate CMake library.

common/utils/threadPool/test/CMakeLists.txt

@@ -0,0 +1,6 @@
+add_executable(test_thread-pool
+  test_thread-pool.c)
+add_dependencies(tests test_thread-pool)
+target_link_libraries(test_thread-pool PRIVATE thread-pool pthread LOG minimal_lib)
+add_test(NAME test_thread-pool
+  COMMAND ./test_thread-pool)

common/utils/threadPool/test/test_thread-pool.c

@@ -0,0 +1,133 @@
+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (the "License"); you may not use this file
+ * except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.openairinterface.org/?page_id=698
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+#include <sched.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <sys/sysinfo.h>
+#include <threadPool/thread-pool.h>
+#include "log.h"
+
+void displayList(notifiedFIFO_t *nf)
+{
+  int n = 0;
+  notifiedFIFO_elt_t *ptr = nf->outF;
+
+  while (ptr) {
+    printf("element: %d, key: %lu\n", ++n, ptr->key);
+    ptr = ptr->next;
+  }
+
+  printf("End of list: %d elements\n", n);
+}
+
+struct testData {
+  int id;
+  int sleepTime;
+  char txt[30];
+};
+
+void processing(void *arg)
+{
+  struct testData *in = (struct testData *)arg;
+  // printf("doing: %d, %s, in thr %ld\n",in->id, in->txt,pthread_self() );
+  sprintf(in->txt, "Done by %ld, job %d", pthread_self(), in->id);
+  in->sleepTime = rand() % 1000;
+  usleep(in->sleepTime);
+  // printf("done: %d, %s, in thr %ld\n",in->id, in->txt,pthread_self() );
+}
+
+int main()
+{
+  logInit();
+  notifiedFIFO_t myFifo;
+  initNotifiedFIFO(&myFifo);
+  pushNotifiedFIFO(&myFifo, newNotifiedFIFO_elt(sizeof(struct testData), 1234, NULL, NULL));
+
+  for (int i = 10; i > 1; i--) {
+    pushNotifiedFIFO(&myFifo, newNotifiedFIFO_elt(sizeof(struct testData), 1000 + i, NULL, NULL));
+  }
+
+  displayList(&myFifo);
+  notifiedFIFO_elt_t *tmp = pullNotifiedFIFO(&myFifo);
+  printf("pulled: %lu\n", tmp->key);
+  displayList(&myFifo);
+  tmp = pullNotifiedFIFO(&myFifo);
+  printf("pulled: %lu\n", tmp->key);
+  displayList(&myFifo);
+  pushNotifiedFIFO(&myFifo, newNotifiedFIFO_elt(sizeof(struct testData), 12345678, NULL, NULL));
+  displayList(&myFifo);
+
+  do {
+    tmp = pollNotifiedFIFO(&myFifo);
+
+    if (tmp) {
+      printf("pulled: %lu\n", tmp->key);
+      displayList(&myFifo);
+    } else
+      printf("Empty list \n");
+  } while (tmp);
+
+  tpool_t pool;
+  char params[] = "1,2,3,4,5";
+  initTpool(params, &pool, true);
+  notifiedFIFO_t worker_back;
+  initNotifiedFIFO(&worker_back);
+
+  //sleep(1);
+  int cumulProcessTime = 0;
+  struct timespec st, end;
+  clock_gettime(CLOCK_MONOTONIC, &st);
+  int nb_jobs = 4;
+  for (int i = 0; i < 1000; i++) {
+    int parall = nb_jobs;
+    for (int j = 0; j < parall; j++) {
+      notifiedFIFO_elt_t *work = newNotifiedFIFO_elt(sizeof(struct testData), i, &worker_back, processing);
+      struct testData *x = (struct testData *)NotifiedFifoData(work);
+      x->id = i;
+      pushTpool(&pool, work);
+    }
+    int sleepmax = 0;
+    while (parall) {
+      tmp = pullTpool(&worker_back, &pool);
+      if (tmp) {
+        parall--;
+        struct testData *dd = NotifiedFifoData(tmp);
+        if (dd->sleepTime > sleepmax)
+          sleepmax = dd->sleepTime;
+        delNotifiedFIFO_elt(tmp);
+      }
+    }
+    cumulProcessTime += sleepmax;
+  }
+  clock_gettime(CLOCK_MONOTONIC, &end);
+  long long dur = (end.tv_sec - st.tv_sec) * 1000 * 1000 + (end.tv_nsec - st.tv_nsec) / 1000;
+  printf("In µs, Total time per group of %d job:%lld, work time per job %d, overhead per job %lld\n",
+         nb_jobs,
+         dur / 1000,
+         cumulProcessTime / 1000,
+         (dur - cumulProcessTime) / (1000 * nb_jobs));
+  return 0;
+}