From b2666b7ec2c923c2d33627f75d032eb4dbbf2937 Mon Sep 17 00:00:00 2001
From: Mitya Selivanov <automainint@guattari.tech>
Date: Thu, 14 Sep 2023 22:55:59 +0200
Subject: interprocess test

---
 source/tests/test_interprocess.c | 124 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 source/tests/test_interprocess.c

(limited to 'source')

diff --git a/source/tests/test_interprocess.c b/source/tests/test_interprocess.c
new file mode 100644
index 0000000..df2a375
--- /dev/null
+++ b/source/tests/test_interprocess.c
@@ -0,0 +1,124 @@
+#ifdef _WIN32
+int main() {
+  return 0;
+}
+#else
+#  include "../kit/threads.h"
+
+#  include <stdio.h>
+#  include <string.h>
+#  include <sys/mman.h>
+#  include <sys/stat.h>
+#  include <fcntl.h>
+#  include <unistd.h>
+
+#  define NAME "/kit_test_interprocess"
+
+enum { STATE_INIT, STATE_READY, STATE_DONE };
+
+enum { SIZE = 64 };
+
+int run_writer() {
+  int f = shm_open(NAME, O_RDWR | O_CREAT, 0660);
+
+  if (f == -1) {
+    printf("%s: shm_open failed.\n", __FUNCTION__);
+    return 1;
+  }
+
+  if (ftruncate(f, SIZE) == -1) {
+    printf("%s: ftruncate failed.\n", __FUNCTION__);
+    fflush(stdout);
+    return 1;
+  }
+
+  void *p = mmap(NULL, SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, f,
+                 0);
+
+  if (p == MAP_FAILED) {
+    printf("%s: mmap failed.\n", __FUNCTION__);
+    fflush(stdout);
+    return 1;
+  }
+
+  unsigned char *bytes = (unsigned char *) p;
+
+  bytes[0] = STATE_INIT;
+  for (int i = 1; i < SIZE; i++) bytes[i] = i;
+  bytes[0] = STATE_READY;
+
+  while (bytes[0] != STATE_DONE) thrd_yield();
+
+  shm_unlink(NAME);
+
+  return 0;
+}
+
+int run_reader() {
+  int f = -1;
+
+  while (f == -1) {
+    f = shm_open(NAME, O_RDWR, 0);
+    thrd_yield();
+  }
+
+  void *p = mmap(NULL, SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, f,
+                 0);
+
+  if (p == MAP_FAILED) {
+    printf("%s: mmap failed.\n", __FUNCTION__);
+    fflush(stdout);
+    return 1;
+  }
+
+  unsigned char *bytes = (unsigned char *) p;
+
+  while (bytes[0] != STATE_READY) thrd_yield();
+
+  int status = 0;
+
+  for (int i = 1; i < SIZE; i++)
+    if (bytes[i] != i) {
+      printf("%s: wrong byte %d\n", __FUNCTION__, i);
+      fflush(stdout);
+      status = 1;
+    }
+
+  bytes[0] = STATE_DONE;
+
+  return status;
+}
+
+int main(int argc, char **argv) {
+  if (argc != 2) {
+    printf("Wrong number of command line arguments %d\n", argc);
+    return 1;
+  }
+
+  int status = 0;
+
+  struct timespec t0;
+  timespec_get(&t0, TIME_UTC);
+
+  if (strcmp(argv[1], "writer") == 0)
+    status = run_writer();
+  else if (strcmp(argv[1], "reader") == 0)
+    status = run_reader();
+  else {
+    printf("Invalid command line argument \"%s\"\n", argv[1]);
+    return 1;
+  }
+
+  struct timespec t1;
+  timespec_get(&t1, TIME_UTC);
+
+  long long sec  = t1.tv_sec - t0.tv_sec;
+  long long nsec = t1.tv_nsec - t0.tv_nsec;
+
+  printf("%s: done in %.2lf msec\n", argv[1],
+         (sec * 1000000000 + nsec) * 0.000001);
+  fflush(stdout);
+
+  return status;
+}
+#endif
-- 
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