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   "id": "b0d1ab05-0c1f-4578-9c1b-568202b95a5c",
   "metadata": {},
   "outputs": [],
   "source": [
    "from pythonbpf import bpf, map, struct, section, bpfglobal, BPF\n",
    "from pythonbpf.helper import ktime\n",
    "from pythonbpf.maps import HashMap, PerfEventArray\n",
    "from ctypes import c_void_p, c_int64"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "85e50d0a-f9d8-468f-8e03-f5f7128f05d8",
   "metadata": {},
   "outputs": [],
   "source": [
    "@bpf\n",
    "@struct\n",
    "class data_t:\n",
    "    ts: c_int64\n",
    "    ms: c_int64\n",
    "\n",
    "\n",
    "@bpf\n",
    "@map\n",
    "def events() -> PerfEventArray:\n",
    "    return PerfEventArray(key_size=c_int64, value_size=c_int64)\n",
    "\n",
    "\n",
    "@bpf\n",
    "@map\n",
    "def last() -> HashMap:\n",
    "    return HashMap(key=c_int64, value=c_int64, max_entries=1)\n",
    "\n",
    "\n",
    "@bpf\n",
    "@section(\"tracepoint/syscalls/sys_enter_sync\")\n",
    "def do_trace(ctx: c_void_p) -> c_int64:\n",
    "    dat, dat.ts, key = data_t(), ktime(), 0\n",
    "    tsp = last.lookup(key)\n",
    "    if tsp:\n",
    "        delta = ktime() - tsp\n",
    "        if delta < 1000000000:\n",
    "            dat.ms = delta // 1000000\n",
    "            events.output(dat)\n",
    "        last.delete(key)\n",
    "    else:\n",
    "        last.update(key, ktime())\n",
    "    return 0\n",
    "\n",
    "\n",
    "@bpf\n",
    "@bpfglobal\n",
    "def LICENSE() -> str:\n",
    "    return \"GPL\"\n",
    "\n",
    "\n",
    "# Compile and load\n",
    "b = BPF()\n",
    "b.load()\n",
    "b.attach_all()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "40bb1107-369f-4be7-9f10-37201900c16b",
   "metadata": {},
   "outputs": [],
   "source": [
    "print(\"Tracing for quick sync's... Ctrl-C to end\")\n",
    "\n",
    "# format output\n",
    "start = 0\n",
    "\n",
    "\n",
    "def callback(cpu, event):\n",
    "    global start\n",
    "    if start == 0:\n",
    "        start = event.ts\n",
    "    event.ts -= start\n",
    "    print(\n",
    "        f\"At time {event.ts / 1e9} s: Multiple sync detected, Last sync: {event.ms} ms ago\"\n",
    "    )\n",
    "\n",
    "\n",
    "perf = b[\"events\"].open_perf_buffer(callback, struct_name=\"data_t\")\n",
    "print(\"Starting to poll... (Ctrl+C to stop)\")\n",
    "print(\"Try running: fork() or clone() system calls to trigger events\")\n",
    "\n",
    "try:\n",
    "    while True:\n",
    "        b[\"events\"].poll(1000)\n",
    "except KeyboardInterrupt:\n",
    "    print(\"Stopping...\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "94a588d9-3a40-437c-a35b-fc40410f3eb7",
   "metadata": {},
   "outputs": [],
   "source": []
  }
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