lec 2 demo

26a93cb3 · TYLER CARAZA-HARTER · bbd7c733 · 26a93cb3
Commit 26a93cb3 authored 4 weeks ago by TYLER CARAZA-HARTER
--- a/lec/11-threads/code/lec2.ipynb
+++ b/lec/11-threads/code/lec2.ipynb
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "de014d74-4685-4f16-85fd-f571fd5a91db",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import threading"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "id": "af3da760-5f6e-40c7-94cd-b505abe59012",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "hello from thread ID:hello from main thread, with ID: 589\n",
+      " 602\n"
+     ]
+    }
+   ],
+   "source": [
+    "def task():\n",
+    "    print(\"hello from thread ID:\", threading.get_native_id())\n",
+    "\n",
+    "#task()\n",
+    "t = threading.Thread(target=task)\n",
+    "t.start()\n",
+    "print(\"hello from main thread, with ID:\", threading.get_native_id())"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "id": "3dd19fcb-2c4a-4b26-b72f-3b87bd8e5bb5",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "1000000"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "total = 0\n",
+    "\n",
+    "def task(count):\n",
+    "    global total\n",
+    "    for i in range(count):\n",
+    "        total += 1\n",
+    "\n",
+    "t = threading.Thread(target=task, args=[1_000_000])\n",
+    "t.start()\n",
+    "t.join() # wait until the thread is done before we continue\n",
+    "total"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "id": "de6ce736-5bdf-42b9-b98c-afee738b8f94",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "1000000"
+      ]
+     },
+     "execution_count": 4,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "total"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "id": "b735264e-f27a-4d27-ba5f-4d6a1f53543e",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "1100428"
+      ]
+     },
+     "execution_count": 9,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "total = 0\n",
+    "\n",
+    "def task(count):\n",
+    "    global total\n",
+    "    for i in range(count):\n",
+    "        total += 1\n",
+    "\n",
+    "t1 = threading.Thread(target=task, args=[1_000_000])\n",
+    "t1.start()\n",
+    "t2 = threading.Thread(target=task, args=[1_000_000])\n",
+    "t2.start()\n",
+    "\n",
+    "t1.join()\n",
+    "t2.join()\n",
+    "\n",
+    "total"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "id": "c3d4a396-1793-4504-b2ff-fb8b81ae48d5",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "  0           RESUME                   0\n",
+      "\n",
+      "  1           LOAD_NAME                0 (total)\n",
+      "              LOAD_CONST               0 (1)\n",
+      "              BINARY_OP               13 (+=)\n",
+      "              STORE_NAME               0 (total)\n",
+      "              RETURN_CONST             1 (None)\n"
+     ]
+    }
+   ],
+   "source": [
+    "import dis\n",
+    "dis.dis(\"total += 1\")"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3.13-nogil",
+   "language": "python",
+   "name": "python3.13-nogil"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.13.2"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}
+%% Cell type:code id:de014d74-4685-4f16-85fd-f571fd5a91db tags:
+
+``` python
+import threading
+```
+
+%% Cell type:code id:af3da760-5f6e-40c7-94cd-b505abe59012 tags:
+
+``` python
+def task():
+    print("hello from thread ID:", threading.get_native_id())
+
+#task()
+t = threading.Thread(target=task)
+t.start()
+print("hello from main thread, with ID:", threading.get_native_id())
+```
+
+%% Output
+
+    hello from thread ID:hello from main thread, with ID: 589
+     602
+
+%% Cell type:code id:3dd19fcb-2c4a-4b26-b72f-3b87bd8e5bb5 tags:
+
+``` python
+total = 0
+
+def task(count):
+    global total
+    for i in range(count):
+        total += 1
+
+t = threading.Thread(target=task, args=[1_000_000])
+t.start()
+t.join() # wait until the thread is done before we continue
+total
+```
+
+%% Output
+
+    1000000
+
+%% Cell type:code id:de6ce736-5bdf-42b9-b98c-afee738b8f94 tags:
+
+``` python
+total
+```
+
+%% Output
+
+    1000000
+
+%% Cell type:code id:b735264e-f27a-4d27-ba5f-4d6a1f53543e tags:
+
+``` python
+total = 0
+
+def task(count):
+    global total
+    for i in range(count):
+        total += 1
+
+t1 = threading.Thread(target=task, args=[1_000_000])
+t1.start()
+t2 = threading.Thread(target=task, args=[1_000_000])
+t2.start()
+
+t1.join()
+t2.join()
+
+total
+```
+
+%% Output
+
+    1100428
+
+%% Cell type:code id:c3d4a396-1793-4504-b2ff-fb8b81ae48d5 tags:
+
+``` python
+import dis
+dis.dis("total += 1")
+```
+
+%% Output
+
+      0           RESUME                   0
+    
+      1           LOAD_NAME                0 (total)
+                  LOAD_CONST               0 (1)
+                  BINARY_OP               13 (+=)
+                  STORE_NAME               0 (total)
+                  RETURN_CONST             1 (None)