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Add mutex example

This commit is contained in:
Timothy Warren 2019-02-05 14:19:29 -05:00
parent 9c148dcf5c
commit ef64ba88ab
5 changed files with 80 additions and 19 deletions
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1
.idea/misc.xml
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@ -29,6 +29,7 @@
<cargoProject FILE="$PROJECT_DIR$/interior_mutability/Cargo.toml" />
<cargoProject FILE="$PROJECT_DIR$/reference_cycles/Cargo.toml" />
<cargoProject FILE="$PROJECT_DIR$/threads/Cargo.toml" />
<cargoProject FILE="$PROJECT_DIR$/mutex/Cargo.toml" />
</component>
<component name="ComposerJsonPluginSettings">
<unboundedVersionInspectionSettings>

5
.idea/rust.iml
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@ -118,6 +118,10 @@
<sourceFolder url="file://$MODULE_DIR$/threads/examples" isTestSource="false" />
<sourceFolder url="file://$MODULE_DIR$/threads/tests" isTestSource="true" />
<sourceFolder url="file://$MODULE_DIR$/threads/benches" isTestSource="true" />
<sourceFolder url="file://$MODULE_DIR$/mutex/src" isTestSource="false" />
<sourceFolder url="file://$MODULE_DIR$/mutex/examples" isTestSource="false" />
<sourceFolder url="file://$MODULE_DIR$/mutex/tests" isTestSource="true" />
<sourceFolder url="file://$MODULE_DIR$/mutex/benches" isTestSource="true" />
<excludeFolder url="file://$MODULE_DIR$/add/add-one/target" />
<excludeFolder url="file://$MODULE_DIR$/add/adder/target" />
<excludeFolder url="file://$MODULE_DIR$/adder/target" />
@ -136,6 +140,7 @@
<excludeFolder url="file://$MODULE_DIR$/minigrep/target" />
<excludeFolder url="file://$MODULE_DIR$/minigrep_v2/target" />
<excludeFolder url="file://$MODULE_DIR$/modules/target" />
<excludeFolder url="file://$MODULE_DIR$/mutex/target" />
<excludeFolder url="file://$MODULE_DIR$/rectangles/target" />
<excludeFolder url="file://$MODULE_DIR$/reference_counting/target" />
<excludeFolder url="file://$MODULE_DIR$/reference_cycles/target" />

46
.idea/workspace.xml
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@ -15,10 +15,10 @@
<component name="FileEditorManager">
<leaf>
<file pinned="false" current-in-tab="true">
<entry file="file://$PROJECT_DIR$/threads/src/main.rs">
<entry file="file://$PROJECT_DIR$/mutex/src/main.rs">
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</entry>
@ -96,6 +96,7 @@
<option value="$PROJECT_DIR$/reference_counting/src/main.rs" />
<option value="$PROJECT_DIR$/reference_cycles/src/main.rs" />
<option value="$PROJECT_DIR$/threads/src/main.rs" />
<option value="$PROJECT_DIR$/mutex/src/main.rs" />
</list>
</option>
</component>
@ -129,12 +130,12 @@
<path>
<item name="rust" type="3d21c010:ScopeViewTreeModel$ProjectNode" />
<item name="rust" type="2674bda8:ScopeViewTreeModel$GroupNode" />
<item name="threads" type="9f88c78c:ScopeViewTreeModel$FileNode" />
<item name="mutex" type="9f88c78c:ScopeViewTreeModel$FileNode" />
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<path>
<item name="rust" type="3d21c010:ScopeViewTreeModel$ProjectNode" />
<item name="rust" type="2674bda8:ScopeViewTreeModel$GroupNode" />
<item name="threads" type="9f88c78c:ScopeViewTreeModel$FileNode" />
<item name="mutex" type="9f88c78c:ScopeViewTreeModel$FileNode" />
<item name="src" type="9f88c78c:ScopeViewTreeModel$FileNode" />
</path>
</expand>
@ -168,7 +169,7 @@
</component>
<component name="PropertiesComponent">
<property name="JavaScriptWeakerCompletionTypeGuess" value="true" />
<property name="com.android.tools.idea.instantapp.provision.ProvisionBeforeRunTaskProvider.myTimeStamp" value="1549393270881" />
<property name="com.android.tools.idea.instantapp.provision.ProvisionBeforeRunTaskProvider.myTimeStamp" value="1549394084677" />
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<property name="js.eslint.eslintPackage" value="$USER_HOME$/.yarn-config/global/node_modules/.bin/eslint" />
<property name="js.eslint.nodeInterpreter" value="project" />
@ -196,7 +197,7 @@
</list>
</option>
</component>
<component name="RunManager" selected="Cargo Command.Run threads">
<component name="RunManager" selected="Cargo Command.Run mutex">
<configuration name="&lt;template&gt;" type="TestNG" default="true" selected="false">
<option name="MAIN_CLASS_NAME" />
<option name="VM_PARAMETERS" value="-ea" />
@ -215,6 +216,16 @@
<option name="Make" enabled="true" />
</method>
</configuration>
<configuration name="Run mutex" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
<option name="channel" value="DEFAULT" />
<option name="command" value="run --package mutex --bin mutex" />
<option name="allFeatures" value="false" />
<option name="nocapture" value="false" />
<option name="backtrace" value="SHORT" />
<option name="workingDirectory" value="file://$PROJECT_DIR$/mutex" />
<envs />
<method v="2" />
</configuration>
<configuration name="Run reference_counting" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
<option name="channel" value="DEFAULT" />
<option name="command" value="run --package reference_counting --bin reference_counting" />
@ -255,16 +266,6 @@
<envs />
<method v="2" />
</configuration>
<configuration name="Test tests::it_sends_an_over_75_percent_warning_message" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
<option name="channel" value="DEFAULT" />
<option name="command" value="test --package interior_mutability --lib tests::it_sends_an_over_75_percent_warning_message -- --exact" />
<option name="allFeatures" value="false" />
<option name="nocapture" value="false" />
<option name="backtrace" value="SHORT" />
<option name="workingDirectory" value="file://$PROJECT_DIR$/interior_mutability" />
<envs />
<method v="2" />
</configuration>
<configuration default="true" type="JUnit" factoryName="JUnit">
<option name="TEST_OBJECT" value="class" />
<option name="WORKING_DIRECTORY" value="$MODULE_DIR$" />
@ -274,11 +275,11 @@
</configuration>
<recent_temporary>
<list>
<item itemvalue="Cargo Command.Run mutex" />
<item itemvalue="Cargo Command.Run threads" />
<item itemvalue="Cargo Command.Run reference_cycles" />
<item itemvalue="Cargo Command.Run reference_counting" />
<item itemvalue="Cargo Command.Test lib::tests" />
<item itemvalue="Cargo Command.Test tests::it_sends_an_over_75_percent_warning_message" />
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@ -765,7 +766,14 @@
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7
mutex/Cargo.toml Normal file
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@ -0,0 +1,7 @@
[package]
name = "mutex"
version = "0.1.0"
authors = ["Timothy Warren <twarren@nabancard.com>"]
edition = "2018"
[dependencies]

40
mutex/src/main.rs Normal file
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@ -0,0 +1,40 @@
use std::sync::{Arc, Mutex}; // Rc is not thread safe, but Arc is. (Atomic Reference Count)
use std::thread;
fn single_thread_example() {
let m = Mutex::new(5);
{
let mut num = m.lock().unwrap();
*num = 6;
} // Reference to mutex value goes out of scope, lock is released
println!("m = {:?}", m);
}
fn multi_thread_example() {
let counter = Arc::new(Mutex::new(0));
let mut handles = vec![];
for _ in 0..10 {
let counter = Arc::clone(&counter);
let handle = thread::spawn(move || {
let mut num = counter.lock().unwrap();
*num += 1;
});
handles.push(handle);
}
for handle in handles {
handle.join().unwrap();
}
println!("Result: {}", *counter.lock().unwrap());
}
fn main() {
single_thread_example();
multi_thread_example();
}