bors 61efe9d298 Auto merge of #111713 - Zoxc:lock-switch, r=nnethercote ... Use conditional synchronization for Lock This changes `Lock` to use synchronization only if `mode::is_dyn_thread_safe` could be true. This reduces overhead for the parallel compiler running with 1 thread. The emitters are changed to use `DynSend` instead of `Send` so they can still use `Lock`. A Rayon thread pool is not used with 1 thread anymore, as session globals contains `Lock`s which are no longer `Sync`. Performance improvement with 1 thread and `cfg(parallel_compiler)`: <table><tr><td rowspan="2">Benchmark</td><td colspan="1"><b>Before</b></th><td colspan="2"><b>After</b></th></tr><tr><td align="right">Time</td><td align="right">Time</td><td align="right">%</th></tr><tr><td>🟣 <b>clap</b>:check</td><td align="right">1.7665s</td><td align="right">1.7336s</td><td align="right">💚 -1.86%</td></tr><tr><td>🟣 <b>hyper</b>:check</td><td align="right">0.2780s</td><td align="right">0.2736s</td><td align="right">💚 -1.61%</td></tr><tr><td>🟣 <b>regex</b>:check</td><td align="right">0.9994s</td><td align="right">0.9824s</td><td align="right">💚 -1.70%</td></tr><tr><td>🟣 <b>syn</b>:check</td><td align="right">1.5875s</td><td align="right">1.5656s</td><td align="right">💚 -1.38%</td></tr><tr><td>🟣 <b>syntex_syntax</b>:check</td><td align="right">6.0682s</td><td align="right">5.9532s</td><td align="right">💚 -1.90%</td></tr><tr><td>Total</td><td align="right">10.6997s</td><td align="right">10.5083s</td><td align="right">💚 -1.79%</td></tr><tr><td>Summary</td><td align="right">1.0000s</td><td align="right">0.9831s</td><td align="right">💚 -1.69%</td></tr></table> cc `@SparrowLii`		2023-08-30 08:03:43 +00:00
..
callbacks.rs	Simplify tls::enter_context.	2023-02-09 15:25:45 +11:00
errors.rs	Write to stdout if - is given as output file	2023-06-06 17:53:29 -04:00
interface.rs	On nightly, dump ICE backtraces to disk	2023-07-19 14:10:07 +00:00
lib.rs	Add rustc_fluent_macro to decouple fluent from rustc_macros	2023-04-18 18:56:22 +00:00
passes.rs	Auto merge of #114908 - cjgillot:no-let-under, r=compiler-errors	2023-08-30 04:29:17 +00:00
proc_macro_decls.rs	Move expansion of query macros in rustc_middle to rustc_middle::query	2023-05-15 08:49:13 +02:00
queries.rs	Fix review comment	2023-08-14 16:16:51 +00:00
tests.rs	Auto merge of #115267 - nikic:revert-elf-relaxation, r=compiler-errors	2023-08-28 03:30:37 +00:00
util.rs	Use conditional synchronization for Lock	2023-08-30 06:10:02 +02:00