llvm-project.git/llvm/lib/Support/Threading.cpp, branch users/nico/python-1

[Support] Remove unused includes (NFC) (#116752)

2024-11-20T14:51:43+00:00

Identified with misc-include-cleaner.

Define llvm::thread::DefaultStackSize to 4 megabytes on AIX

2023-07-19T18:57:55+00:00

Link time thinLTO spawns pthreads to parallelize optimization and
codegen of the input bitcode files. On AIX, the default pthread
stack size limit is ~192k for 64-bit programs; insufficient for a
normal LLVM compilation.

Reviewed By: ZarkoCA, MaskRay

Differential Revision: https://reviews.llvm.org/D155731

Include instead of "llvm/ADT/Optional.h"

2022-12-18T08:28:54+00:00

This is part of an effort to migrate from llvm::Optional to
std::optional:

https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716

[Support] llvm::Optional => std::optional

2022-12-16T08:49:10+00:00

https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716

Threading: Convert Optional to std::optional

2022-12-01T23:57:17+00:00

dthorn: Relanding after fix-forward.

Revert "Threading: Convert Optional to std::optional"

2022-12-01T23:42:25+00:00

This reverts commit 5e50b8089aee249d77542ea858d956568ec6581f.

This commit breaks the build for BOLT:
  bolt/lib/Profile/DataAggregator.cpp:264:66: error: no viable
  conversion from 'Optional[3]' to
  'ArrayRef>'

Threading: Convert Optional to std::optional

2022-12-01T22:36:05+00:00

[Support] Move getHostNumPhysicalCores to Threading.h

2022-11-29T13:14:13+00:00

This change is focussed on simplifying `Support/Host.h` to only do
target detection. In this case, this function is close in usage to
existing functions in `Support/Threading.h`, so I moved it into there.
The function is also renamed to `llvm::get_physical_cores()` to match
the style of threading's functions.

The big change here is that now if you have threading disabled,
`llvm::get_physical_cores()` will return -1, as if it had not been able
to work out the right info. This is due to how Threading.cpp includes
OS-specific code/headers. This seems ok, as if threading is disabled,
LLVM should not need to know the number of physical cores.

Differential Revision: https://reviews.llvm.org/D137836

Revert "[Support] Move getHostNumPhysicalCores to Threading.h"

2022-11-25T14:11:56+00:00

This reverts commit 5577207d6d3e0642ea047a8dfbfcf3ad372a7f25.

This breaks building LLVM on recent macOS. Error messages below:

llvm/lib/Support/Threading.cpp:190:3: error: use of undeclared
identifier 'sysctlbyname'
  sysctlbyname("hw.physicalcpu", &count, &len, NULL, 0);
    ^

llvm/lib/Support/Threading.cpp:193:13: error: use of undeclared
identifier 'CTL_HW'
    nm[0] = CTL_HW;
            ^

llvm/lib/Support/Threading.cpp:194:13: error: use of undeclared identifier 'HW_AVAILCPU'
    nm[1] = HW_AVAILCPU;
            ^

llvm/lib/Support/Threading.cpp:195:5: error: use of undeclared identifier 'sysctl'
    sysctl(nm, 2, &count, &len, NULL, 0);
    ^

[Support] Move getHostNumPhysicalCores to Threading.h

2022-11-25T12:51:36+00:00

This change is focussed on simplifying `Support/Host.h` to only do
target detection. In this case, this function is close in usage to
existing functions in `Support/Threading.h`, so I moved it into there.
The function is also renamed to `llvm::get_physical_cores()` to match
the style of threading's functions.

Differential Revision: https://reviews.llvm.org/D137836