[Multi-Thread] Support working in multi-thread environment

.gitignore

@@ -1,5 +1,6 @@
 kubernetes/build/
 .vs/
+.vscode/
 
 # Prerequisites
 *.d

README.md

@@ -78,6 +78,7 @@ list all pods:
     basePath = NULL;
     sslConfig = NULL;
     apiKeys = NULL;
+    apiClient_unsetupGlobalEnv();
 ```
 
 list all pods in cluster:
@@ -121,6 +122,7 @@ list all pods in cluster:
     basePath = NULL;
     sslConfig = NULL;
     apiKeys = NULL;
+    apiClient_unsetupGlobalEnv();
 ```
 
 

examples/auth_provider/main.c

@@ -59,6 +59,7 @@ int main(int argc, char *argv[])
     basePath = NULL;
     sslConfig = NULL;
     apiKeys = NULL;
+    apiClient_unsetupGlobalEnv();
 
     return 0;
 }

examples/create_pod/main.c

@@ -96,5 +96,7 @@ int main(int argc, char *argv[])
 
     apiClient_free(k8sApiClient);
     k8sApiClient = NULL;
+    apiClient_unsetupGlobalEnv();
 
+    return 0;
 }

examples/delete_pod/main.c

@@ -58,6 +58,7 @@ int main(int argc, char *argv[])
     basePath = NULL;
     sslConfig = NULL;
     apiKeys = NULL;
+    apiClient_unsetupGlobalEnv();
 
     return 0;
 }

examples/exec_provider/list_pod_by_exec_provider.c

@@ -63,6 +63,7 @@ int main(int argc, char *argv[])
 
     apiClient_free(k8sApiClient);
     k8sApiClient = NULL;
+    apiClient_unsetupGlobalEnv();
 
     return rc;
 }

examples/generic/main.c

@@ -60,6 +60,7 @@ int main(int argc, char *argv[])
     basePath = NULL;
     sslConfig = NULL;
     apiKeys = NULL;
+    apiClient_unsetupGlobalEnv();
 
     return 0;
 }

examples/list_pod/main.c

@@ -59,6 +59,7 @@ int main(int argc, char *argv[])
     basePath = NULL;
     sslConfig = NULL;
     apiKeys = NULL;
+    apiClient_unsetupGlobalEnv();
 
     return 0;
 }

examples/list_pod_incluster/main.c

@@ -59,6 +59,7 @@ int main(int argc, char *argv[])
     basePath = NULL;
     sslConfig = NULL;
     apiKeys = NULL;
+    apiClient_unsetupGlobalEnv();
 
     return 0;
 }

examples/watch_list_pod/main.c

@@ -105,6 +105,7 @@ int main(int argc, char *argv[])
     basePath = NULL;
     sslConfig = NULL;
     apiKeys = NULL;
+    apiClient_unsetupGlobalEnv();
 
     return 0;
 }

kubernetes/include/apiClient.h

@@ -45,4 +45,16 @@ void sslConfig_free(sslConfig_t *sslConfig);
 
 char *strReplace(char *orig, char *rep, char *with);
 
+/*
+ * In single thread program, the function apiClient_setupGlobalEnv is not needed.
+ * But in multi-thread program, apiClient_setupGlobalEnv must be called before any worker thread is created
+ */
+void apiClient_setupGlobalEnv();
+
+/*
+ * This function apiClient_unsetupGlobalEnv must be called whether single or multiple program.
+ * In multi-thread program, it is must be called after all worker threads end.
+ */
+void apiClient_unsetupGlobalEnv();
+
 #endif // INCLUDE_API_CLIENT_H

kubernetes/src/apiClient.c

@@ -6,6 +6,14 @@
 
 size_t writeDataCallback(void *buffer, size_t size, size_t nmemb, void *userp);
 
+void apiClient_setupGlobalEnv() {
+    curl_global_init(CURL_GLOBAL_ALL);
+}
+
+void apiClient_unsetupGlobalEnv() {
+    curl_global_cleanup();
+}
+
 apiClient_t *apiClient_create() {
     curl_global_init(CURL_GLOBAL_ALL);
     apiClient_t *apiClient = malloc(sizeof(apiClient_t));
@@ -24,7 +32,7 @@ apiClient_t *apiClient_create_with_base_path(const char *basePath
 , sslConfig_t *sslConfig
 , list_t *apiKeys_BearerToken
 ) {
-    curl_global_init(CURL_GLOBAL_ALL);
+
     apiClient_t *apiClient = malloc(sizeof(apiClient_t));
     if(basePath){
         apiClient->basePath = strdup(basePath);
@@ -78,7 +86,6 @@ void apiClient_free(apiClient_t *apiClient) {
     }
 
     free(apiClient);
-    curl_global_cleanup();
 }
 
 sslConfig_t *sslConfig_create(const char *clientCertFile, const char *clientKeyFile, const char *CACertFile, int insecureSkipTlsVerify) {