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Diffstat (limited to 'packages/Python/lldbsuite/test/linux/thread/create_during_instruction_step/main.cpp')
-rw-r--r-- | packages/Python/lldbsuite/test/linux/thread/create_during_instruction_step/main.cpp | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/packages/Python/lldbsuite/test/linux/thread/create_during_instruction_step/main.cpp b/packages/Python/lldbsuite/test/linux/thread/create_during_instruction_step/main.cpp new file mode 100644 index 000000000000..079e8b13798c --- /dev/null +++ b/packages/Python/lldbsuite/test/linux/thread/create_during_instruction_step/main.cpp @@ -0,0 +1,55 @@ +//===-- main.cpp ------------------------------------------------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +// This file deliberately uses low level linux-specific API for thread creation because: +// - instruction-stepping over thread creation using higher-level functions was very slow +// - it was also unreliable due to single-stepping bugs unrelated to this test +// - some threading libraries do not create or destroy threads when we would expect them to + +#include <sched.h> + +#include <atomic> +#include <cstdio> + +enum { STACK_SIZE = 0x2000 }; + +static uint8_t child_stack[STACK_SIZE]; + +pid_t child_tid; + +std::atomic<bool> flag(false); + +int thread_main(void *) +{ + while (! flag) // Make sure the thread does not exit prematurely + ; + + return 0; +} + +int main () +{ + int ret = clone(thread_main, + child_stack + STACK_SIZE/2, // Don't care whether the stack grows up or down, + // just point to the middle + CLONE_CHILD_CLEARTID | CLONE_FILES | CLONE_FS | CLONE_PARENT_SETTID | + CLONE_SIGHAND | CLONE_SYSVSEM | CLONE_THREAD | CLONE_VM, + nullptr, // thread_main argument + &child_tid); + + if (ret == -1) + { + perror("clone"); + return 1; + } + + flag = true; + + return 0; +} |