From a7f779193da4dd7573b0f3ce8ce1cd1ac6a12481 Mon Sep 17 00:00:00 2001
From: turbocat <turbocat@kolibrios.org>
Date: Tue, 2 Aug 2022 05:39:06 +0000
Subject: [PATCH] libc.obj : added a very simple example of working with
 futexes

git-svn-id: svn://kolibrios.org@9867 a494cfbc-eb01-0410-851d-a64ba20cac60
---
 .../ktcc/trunk/libc.obj/samples/Makefile      |  6 +-
 .../ktcc/trunk/libc.obj/samples/build_all.sh  |  1 +
 .../ktcc/trunk/libc.obj/samples/futex.c       | 57 +++++++++++++++++++
 3 files changed, 62 insertions(+), 2 deletions(-)
 create mode 100644 programs/develop/ktcc/trunk/libc.obj/samples/futex.c

diff --git a/programs/develop/ktcc/trunk/libc.obj/samples/Makefile b/programs/develop/ktcc/trunk/libc.obj/samples/Makefile
index 0e7d2605cb..49725be3da 100644
--- a/programs/develop/ktcc/trunk/libc.obj/samples/Makefile
+++ b/programs/develop/ktcc/trunk/libc.obj/samples/Makefile
@@ -5,7 +5,8 @@ KPACK = kpack
 CFLAGS = -I../include -B../../bin -I../../../../../../contrib/sdk/sources/SDL-1.2.2_newlib/include
 LIBS   = -lbox_lib -lshell -lSDL -lsound -lnetwork -lrasterworks -limg -ldialog -lmsgbox
 
-BIN =   stdio_test.kex \
+BIN = \
+	stdio_test.kex \
 	basic_gui.kex \
 	http_tcp_demo.kex \
 	math_test.kex \
@@ -25,7 +26,8 @@ BIN =   stdio_test.kex \
 	shell_test.kex \
 	libc_test.kex \
 	pipe.kex \
-	defgen.kex
+	defgen.kex \
+	futex.kex
 	
 all: $(BIN)
 	
diff --git a/programs/develop/ktcc/trunk/libc.obj/samples/build_all.sh b/programs/develop/ktcc/trunk/libc.obj/samples/build_all.sh
index 70eb6315d0..fb6e57cf75 100644
--- a/programs/develop/ktcc/trunk/libc.obj/samples/build_all.sh
+++ b/programs/develop/ktcc/trunk/libc.obj/samples/build_all.sh
@@ -22,5 +22,6 @@ cp     clayer/logo.png /tmp0/1/tcc_samples/logo.png
 ../tcc libc_test.c -o /tmp0/1/tcc_samples/libc_test
 ../tcc defgen.c -o /tmp0/1/tcc_samples/defgen
 ../tcc pipe.c -o /tmp0/1/tcc_samples/pipe
+../tcc futex.c -o /tmp0/1/tcc_samples/futex
 "/sys/File managers/Eolite" /tmp0/1/tcc_samples
 exit
diff --git a/programs/develop/ktcc/trunk/libc.obj/samples/futex.c b/programs/develop/ktcc/trunk/libc.obj/samples/futex.c
new file mode 100644
index 0000000000..f0ce5edf68
--- /dev/null
+++ b/programs/develop/ktcc/trunk/libc.obj/samples/futex.c
@@ -0,0 +1,57 @@
+#include <sys/ksys.h>
+
+/* Very simple example of working with futexes in Kolibri OS.
+ * Author turbocat (Maxim Logaev).
+ * Thanks to Vitaly Krylov for help.
+ * 
+ * The result of the program execution can be seen in the debug board.
+*/
+
+#define TH_STACK_SIZE 1024
+#define TH_LOCK       1
+#define TH_UNLOCK     0
+
+uint8_t th_stack[TH_STACK_SIZE];
+
+int glob_var = 0;
+int th_lock = TH_UNLOCK;
+uint32_t futex = 0;
+
+void th_main(void)
+{
+    _ksys_debug_puts("Child thread start\n");
+    _ksys_futex_wait(futex, TH_LOCK, 0);
+    glob_var = 99;
+    _ksys_debug_puts("Child thread end\n");
+    _ksys_exit();
+}
+
+int main(void)
+{
+    _ksys_debug_puts("Parrent thread start");
+    futex = _ksys_futex_create(&th_lock);
+    th_lock = TH_LOCK;
+
+    if (_ksys_create_thread(th_main, th_stack) == -1) {
+        _ksys_debug_puts("Unable to create a new thread!\n");
+        return 1;
+    }
+
+    glob_var = 88;
+    _ksys_thread_yield();
+
+    _ksys_delay(100);
+
+    if (glob_var == 88) {
+        _ksys_debug_puts("Futex test OK :)\n");
+    } else {
+        _ksys_debug_puts("Futex test FAIL :(\n");
+    }
+
+    th_lock = TH_UNLOCK;
+    _ksys_futex_wake(futex, 1);
+
+    _ksys_futex_destroy(futex);
+    _ksys_debug_puts("Parrent thread end");
+    return 0;
+}