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| author | Sam Gross <colesbury@gmail.com> | 2024-01-23 18:08:23 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2024-01-23 18:08:23 (GMT) |
| commit | 441affc9e7f419ef0b68f734505fa2f79fe653c7 (patch) | |
| tree | 1c7771190fffc7927ab70f485500521a96de7938 /Include/pymacro.h | |
| parent | 5f1997896d9c3ecf92e9863177c452b468a6a2c8 (diff) | |
| download | cpython-441affc9e7f419ef0b68f734505fa2f79fe653c7.zip cpython-441affc9e7f419ef0b68f734505fa2f79fe653c7.tar.gz cpython-441affc9e7f419ef0b68f734505fa2f79fe653c7.tar.bz2 | |
gh-111964: Implement stop-the-world pauses (gh-112471)
The `--disable-gil` builds occasionally need to pause all but one thread. Some
examples include:
* Cyclic garbage collection, where this is often called a "stop the world event"
* Before calling `fork()`, to ensure a consistent state for internal data structures
* During interpreter shutdown, to ensure that daemon threads aren't accessing Python objects
This adds the following functions to implement global and per-interpreter pauses:
* `_PyEval_StopTheWorldAll()` and `_PyEval_StartTheWorldAll()` (for the global runtime)
* `_PyEval_StopTheWorld()` and `_PyEval_StartTheWorld()` (per-interpreter)
(The function names may change.)
These functions are no-ops outside of the `--disable-gil` build.
Diffstat (limited to 'Include/pymacro.h')
| -rw-r--r-- | Include/pymacro.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Include/pymacro.h b/Include/pymacro.h index 9d264fe..cd6fc4e 100644 --- a/Include/pymacro.h +++ b/Include/pymacro.h @@ -160,6 +160,9 @@ Py_FatalError("Unreachable C code path reached") #endif +#define _Py_CONTAINER_OF(ptr, type, member) \ + (type*)((char*)ptr - offsetof(type, member)) + // Prevent using an expression as a l-value. // For example, "int x; _Py_RVALUE(x) = 1;" fails with a compiler error. #define _Py_RVALUE(EXPR) ((void)0, (EXPR)) |