2 files changed, 54 insertions, 0 deletions
diff --git a/context/main.c b/context/main.c
new file mode 100644
index 0000000..f468311
--- /dev/null
+++ b/context/main.c
@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <stdbool.h>
+#include <ucontext.h>
+#include <stdlib.h>
+
+int res;
+ucontext_t c_main, c_worker;
+char stack[1 << 12];
+extern bool done;
+
+void worker(void);
+
+void outfunc(int i)
+{
+    printf("outfunc %d\n", i);
+    res = i;
+    swapcontext(&c_worker, &c_main);
+}
+
+int main()
+{
+    char *q = malloc(10);
+    printf("ptr %p\n", q);
+    getcontext(&c_main);
+    c_worker = c_main;
+    c_worker.uc_stack.ss_sp = stack;
+    c_worker.uc_stack.ss_size = sizeof(stack);
+    c_worker.uc_link = &c_main;
+    makecontext(&c_worker, (void (*) (void)) worker, 1, q);
+    swapcontext(&c_main, &c_worker);
+    while (!done)
+    {
+        printf("Got %d\n", res);
+        swapcontext(&c_main, &c_worker);
+    }
+    free(q);
+    return 0;
+}
diff --git a/context/worker.c b/context/worker.c
new file mode 100644
index 0000000..647c6f3
--- /dev/null
+++ b/context/worker.c
@@ -0,0 +1,16 @@
+#include <stdbool.h>
+#include <stdio.h>
+
+void *outfunc(int);
+bool done = false;
+
+void worker(char *q)
+{
+    printf("ptr %p\n", q);
+    for (int i = 0; i < 20; i++)
+    {
+        outfunc(i);
+    }
+
+    done = true;
+}