Add libhv and test http client

vendor/libhv/include/hv/hproc.h

@@ -0,0 +1,69 @@
+#ifndef HV_PROC_H_
+#define HV_PROC_H_
+
+#include "hplatform.h"
+
+typedef struct proc_ctx_s {
+    pid_t           pid; // tid in Windows
+    time_t          start_time;
+    int             spawn_cnt;
+    procedure_t     init;
+    void*           init_userdata;
+    procedure_t     proc;
+    void*           proc_userdata;
+    procedure_t     exit;
+    void*           exit_userdata;
+} proc_ctx_t;
+
+static inline void hproc_run(proc_ctx_t* ctx) {
+    if (ctx->init) {
+        ctx->init(ctx->init_userdata);
+    }
+    if (ctx->proc) {
+        ctx->proc(ctx->proc_userdata);
+    }
+    if (ctx->exit) {
+        ctx->exit(ctx->exit_userdata);
+    }
+}
+
+#ifdef OS_UNIX
+// unix use multi-processes
+static inline int hproc_spawn(proc_ctx_t* ctx) {
+    ++ctx->spawn_cnt;
+    ctx->start_time = time(NULL);
+    pid_t pid = fork();
+    if (pid < 0) {
+        perror("fork");
+        return -1;
+    } else if (pid == 0) {
+        // child process
+        ctx->pid = getpid();
+        hproc_run(ctx);
+        exit(0);
+    } else if (pid > 0) {
+        // parent process
+        ctx->pid = pid;
+    }
+    return pid;
+}
+#elif defined(OS_WIN)
+// win32 use multi-threads
+static void win_thread(void* userdata) {
+    proc_ctx_t* ctx = (proc_ctx_t*)userdata;
+    ctx->pid = GetCurrentThreadId(); // tid in Windows
+    hproc_run(ctx);
+}
+static inline int hproc_spawn(proc_ctx_t* ctx) {
+    ++ctx->spawn_cnt;
+    ctx->start_time = time(NULL);
+    HANDLE h = (HANDLE)_beginthread(win_thread, 0, ctx);
+    if (h == NULL) {
+        return -1;
+    }
+    ctx->pid = GetThreadId(h); // tid in Windows
+    return ctx->pid;
+}
+#endif
+
+#endif // HV_PROC_H_