Add valgrind based memory leak check script

.travis.yml

@@ -15,6 +15,10 @@ script:
   # Adding an extra delay in some places in the code. Makes the tests hit other edge cases.
   - cargo test --features test-delay --verbose
   - LOOM_MAX_BRANCHES=100000 LOOM_LOG=1 RUSTFLAGS="--cfg loom" cargo test
+  - if [[ $(uname -s) == "Linux" ]]; then
+      cargo install cargo-valgrind;
+      ./check_mem_leaks.sh;
+    fi
   - if [[ "${TRAVIS_RUST_VERSION}" = "stable" && $(uname -s) == "Linux" ]]; then
       rustup component add rustfmt-preview;
       rustfmt --version;

check_mem_leaks.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+set -eu
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+cd "$SCRIPT_DIR"
+
+for example_path in examples/*.rs; do
+    example_filename=$(basename -- $example_path)
+    example=${example_filename%.*}
+    echo $example
+    cargo valgrind --example "$example"
+    cargo valgrind --features test-delay --example "$example"
+done