From b67cb68ba59fd36076e5961139cb3c953c69bed0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Alex=20Benn=C3=A9e?= Date: Wed, 5 Oct 2016 11:13:04 -0700 Subject: [PATCH] linux-user: enable parallel code generation on clone MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The variable parallel_cpus controls the generation of thread aware atomic code. We only need to set it once we clone our first thread. At this point any existing translations need to be thrown away. Reviewed-by: Emilio G. Cota Signed-off-by: Alex Bennée Signed-off-by: Richard Henderson --- linux-user/syscall.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index db697c0bf3..7b77503f94 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -6164,6 +6164,14 @@ static int do_fork(CPUArchState *env, unsigned int flags, abi_ulong newsp, sigfillset(&sigmask); sigprocmask(SIG_BLOCK, &sigmask, &info.sigmask); + /* If this is our first additional thread, we need to ensure we + * generate code for parallel execution and flush old translations. + */ + if (!parallel_cpus) { + parallel_cpus = true; + tb_flush(cpu); + } + ret = pthread_create(&info.thread, &attr, clone_func, &info); /* TODO: Free new CPU state if thread creation failed. */