From c8bf38e5fb717d40635a2a89b22ed71b0de4266b Mon Sep 17 00:00:00 2001
From: Toni Uhlig <matzeton@googlemail.com>
Date: Tue, 1 Dec 2020 13:33:34 +0100
Subject: Squashed 'dependencies/uthash/' content from commit 8e67ced

git-subtree-dir: dependencies/uthash
git-subtree-split: 8e67ced1d1c5bd8141c542a22630e6de78aa6b90
---
 tests/threads/test1.c | 116 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 tests/threads/test1.c

(limited to 'tests/threads/test1.c')

diff --git a/tests/threads/test1.c b/tests/threads/test1.c
new file mode 100644
index 000000000..8d6cb6747
--- /dev/null
+++ b/tests/threads/test1.c
@@ -0,0 +1,116 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include "uthash.h"
+
+#undef uthash_noexpand_fyi
+#define uthash_noexpand_fyi(tbl) fprintf(stderr,"warning: bucket expansion inhibited\n")
+
+#define LOOPS 100000
+
+typedef struct {
+  int i;
+  UT_hash_handle hh;
+} elt;
+
+elt *elts=NULL; /* this is our hash table which two threads will use */
+pthread_rwlock_t lock;
+
+void *thread_routine_r( void *arg ) {
+    int i;
+    long num_found=0;
+    elt *e;
+
+    for(i=0;i<LOOPS;i++) {
+      if (pthread_rwlock_rdlock(&lock) != 0) {
+        fprintf(stderr,"can't acquire read lock\n");
+        exit(-1);
+      }
+      HASH_FIND_INT(elts, &i, e);
+      if (e) num_found++;
+      pthread_rwlock_unlock(&lock);
+    }
+    return (void*)num_found;
+}
+void *thread_routine_w( void *arg ) {
+    int i;
+    long num_deld=0;
+    elt *e;
+
+    for(i=0;i<LOOPS;i++) {
+      if (pthread_rwlock_wrlock(&lock) != 0) {
+        fprintf(stderr,"can't acquire write lock\n");
+        exit(-1);
+      }
+      HASH_FIND_INT(elts, &i, e);
+      if (e) {
+        /* HASH_DEL(elts, e); */
+        /* num_deld++; */
+      } else {
+        e = malloc(sizeof(elt));
+        if (!e) exit(-1);
+        e->i = i;
+        HASH_ADD_INT(elts, i, e);
+      }
+      pthread_rwlock_unlock(&lock);
+    }
+    return (void*)num_deld;
+}
+
+int main() {
+    unsigned i;
+    long num_added=0;
+    int status;
+    pthread_t thread_r1,thread_r2,thread_w1,thread_w2;
+    void *thread_result;
+    elt tmp, *e;
+
+    if (pthread_rwlock_init(&lock,NULL) != 0) {
+      fprintf(stderr,"lock init failed\n");
+      exit(-1);
+    }
+
+    if (( status = pthread_create( &thread_r1, NULL, thread_routine_r, NULL) )) {
+        printf("failure: status %d\n", status);
+        exit(-1);
+    }
+    if (( status = pthread_create( &thread_r2, NULL, thread_routine_r, NULL) )) {
+        printf("failure: status %d\n", status);
+        exit(-1);
+    }
+    if (( status = pthread_create( &thread_w1, NULL, thread_routine_w, NULL) )) {
+        printf("failure: status %d\n", status);
+        exit(-1);
+    }
+    if (( status = pthread_create( &thread_w2, NULL, thread_routine_w, NULL) )) {
+        printf("failure: status %d\n", status);
+        exit(-1);
+    }
+
+    status = pthread_join( thread_r1, &thread_result );
+    printf("thread result: %d %ld\n", status, (long)thread_result);
+
+    status = pthread_join( thread_r2, &thread_result );
+    printf("thread result: %d %ld\n", status, (long)thread_result);
+
+    status = pthread_join( thread_w1,  &thread_result );
+    printf("thread result: %d %ld\n", status, (long)thread_result);
+
+    status = pthread_join( thread_w2,  &thread_result );
+    printf("thread result: %d %ld\n", status, (long)thread_result);
+
+    i = HASH_COUNT(elts);
+    printf("final count of items in hash: %u\n", i);
+
+    if (pthread_rwlock_destroy(&lock) != 0) {
+      fprintf(stderr,"lock destroy failed\n");
+      exit(-1);
+    }
+}
-- 
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