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41c7e96f1a
* In order to prevent ArrayBuffers from getting garbage collected by V8, we used to store a v8::Persistent<ArrayBuffer> in a map. This patch introduces a custom ArrayBuffer allocator which doesn't use Persistent handles, but instead stores a pointer to the actual ArrayBuffer data alongside with a reference count. Since creating Persistent handles has quite a bit of overhead, this change significantly increases performance. Various HTTP server benchmarks report about 5-10% more requests per second than before. * Previously the Persistent handle that prevented garbage collection had to be released manually, and this wasn't always done, which was causing memory leaks. This has been resolved by introducing a new `PinnedBuf` type in both Rust and C++ that automatically re-enables garbage collection when it goes out of scope. * Zero-copy buffers are now correctly wrapped in an Option if there is a possibility that they're not present. This clears up a correctness issue where we were creating zero-length slices from a null pointer, which is against the rules.
32 lines
717 B
Rust
32 lines
717 B
Rust
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
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#[macro_use]
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extern crate log;
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extern crate futures;
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extern crate libc;
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mod flags;
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mod isolate;
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mod js_errors;
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mod libdeno;
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mod modules;
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mod shared_queue;
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pub use crate::flags::v8_set_flags;
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pub use crate::isolate::*;
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pub use crate::js_errors::*;
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pub use crate::libdeno::deno_buf;
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pub use crate::libdeno::deno_mod;
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pub use crate::libdeno::PinnedBuf;
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pub use crate::modules::*;
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pub fn v8_version() -> &'static str {
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use std::ffi::CStr;
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let version = unsafe { libdeno::deno_v8_version() };
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let c_str = unsafe { CStr::from_ptr(version) };
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c_str.to_str().unwrap()
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}
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#[test]
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fn test_v8_version() {
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assert!(v8_version().len() > 3);
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}
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