implemented thread APIs for windows

src/freebsd/thread.c

@@ -54,7 +54,7 @@ LM_EnumThreadsEx(const lm_process_t *process,
 	for (i = 0; i < nprocs; ++i) {
 		thread.tid = (lm_tid_t)procs[i].ki_tid;
 
-		if (!callback(&thread, arg))
+		if (callback(&thread, arg) == LM_FALSE)
 			break;
 	}
 

src/linux/thread.c

@@ -55,7 +55,7 @@ LM_EnumThreadsEx(const lm_process_t *process,
 		if (thread.tid == 0 && strcmp(dirent->d_name, "0"))
 			continue;
 
-		if (!callback(&thread, arg))
+		if (callback(&thread, arg) == LM_FALSE)
 			break;
 	}
 

src/win/thread.c

@@ -0,0 +1,92 @@
+/*
+ *  ----------------------------------
+ * |         libmem - by rdbo         |
+ * |      Memory Hacking Library      |
+ *  ----------------------------------
+ */
+
+/*
+ * Copyright (C) 2023    Rdbo
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License version 3
+ * as published by the Free Software Foundation.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <libmem/libmem.h>
+#include <windows.h>
+
+LM_API lm_bool_t LM_CALL
+LM_EnumThreadsEx(const lm_process_t *process,
+		 lm_bool_t (LM_CALL *callback)(lm_thread_t *thread,
+					       lm_void_t   *arg),
+		 lm_void_t          *arg)
+{
+	lm_bool_t result = LM_FALSE;
+	HANDLE hsnap;
+	THREADENTRY32 entry;
+	lm_thread_t thread;
+
+	if (!process || !callback)
+		return result;
+
+	/*
+	 * NOTE: You can't use the 'th32ProcessID' parameter to get only
+	 *       threads from a specific process:
+	 * From: https://learn.microsoft.com/en-us/windows/win32/api/tlhelp32/nf-tlhelp32-createtoolhelp32snapshot
+	 *
+	 * "To identify the threads that belong to a specific process, compare its process identifier
+	 *  to the th32OwnerProcessID member of the THREADENTRY32 structure when enumerating the threads."
+	 *
+	 * "[in] th32ProcessID
+	 * ...
+	 * This parameter is used when the TH32CS_SNAPHEAPLIST, TH32CS_SNAPMODULE,
+	 * TH32CS_SNAPMODULE32, or TH32CS_SNAPALL value is specified. Otherwise,
+	 * it is ignored and all processes are included in the snapshot."
+	 */
+
+	hsnap = CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
+	if (hsnap == INVALID_HANDLE_VALUE)
+		return result;
+
+	entry.dwSize = sizeof(THREADENTRY32);
+	if (!Thread32First(hsnap, &entry))
+		goto CLOSE_EXIT;
+
+	thread.owner_pid = process->pid;
+	do {
+		if (entry.th32OwnerProcessID != process->pid)
+			continue;
+
+		thread.tid = (lm_tid_t)entry.th32ThreadID;
+
+		if (callback(&thread, arg) == LM_FALSE)
+			break;
+	} while (Thread32Next(hsnap, &entry));
+
+	result = LM_TRUE;
+CLOSE_EXIT:
+	CloseHandle(hsnap);
+	return result;
+}
+
+/********************************/
+
+LM_API lm_bool_t LM_CALL
+LM_GetThread(lm_thread_t *thread_out)
+{
+	if (!thread_out)
+		return LM_FALSE;
+
+	thread_out->tid = (lm_tid_t)GetCurrentThreadId();
+	thread_out->owner_pid = (lm_pid_t)GetCurrentProcessId();
+
+	return LM_TRUE;
+}