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cosmopolitan/third_party/dlmalloc/README.cosmo

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Improve synchronization - Fix bugs in kDos2Errno definition - malloc() should now be thread safe - Fix bug in rollup.com header generator - Fix open(O_APPEND) on the New Technology - Fix select() on the New Technology and test it - Work towards refactoring i/o for thread safety - Socket reads and writes on NT now poll for signals - Work towards i/o completion ports on the New Technology - Make read() and write() intermittently check for signals - Blinkenlights keyboard i/o so much better on NT w/ poll() - You can now poll() files and sockets at the same time on NT - Fix bug in appendr() that manifests with dlmalloc footers off
2022-04-14 23:39:48 -07:00
DESCRIPTION
Initial import
2020-06-15 07:18:57 -07:00
Improve synchronization - Fix bugs in kDos2Errno definition - malloc() should now be thread safe - Fix bug in rollup.com header generator - Fix open(O_APPEND) on the New Technology - Fix select() on the New Technology and test it - Work towards refactoring i/o for thread safety - Socket reads and writes on NT now poll for signals - Work towards i/o completion ports on the New Technology - Make read() and write() intermittently check for signals - Blinkenlights keyboard i/o so much better on NT w/ poll() - You can now poll() files and sockets at the same time on NT - Fix bug in appendr() that manifests with dlmalloc footers off
2022-04-14 23:39:48 -07:00
malloc-2.8.6
written by Doug Lea
Initial import
2020-06-15 07:18:57 -07:00
Improve synchronization - Fix bugs in kDos2Errno definition - malloc() should now be thread safe - Fix bug in rollup.com header generator - Fix open(O_APPEND) on the New Technology - Fix select() on the New Technology and test it - Work towards refactoring i/o for thread safety - Socket reads and writes on NT now poll for signals - Work towards i/o completion ports on the New Technology - Make read() and write() intermittently check for signals - Blinkenlights keyboard i/o so much better on NT w/ poll() - You can now poll() files and sockets at the same time on NT - Fix bug in appendr() that manifests with dlmalloc footers off
2022-04-14 23:39:48 -07:00
LICENSE
Make fixes, improvements, and chibicc python bindings - python now mixes audio 10x faster - python octal notation is restored - chibicc now builds code 3x faster - chibicc now has help documentation - chibicc can now generate basic python bindings - linenoise now supports some paredit-like features See #141
2021-10-08 08:11:51 -07:00
Improve synchronization - Fix bugs in kDos2Errno definition - malloc() should now be thread safe - Fix bug in rollup.com header generator - Fix open(O_APPEND) on the New Technology - Fix select() on the New Technology and test it - Work towards refactoring i/o for thread safety - Socket reads and writes on NT now poll for signals - Work towards i/o completion ports on the New Technology - Make read() and write() intermittently check for signals - Blinkenlights keyboard i/o so much better on NT w/ poll() - You can now poll() files and sockets at the same time on NT - Fix bug in appendr() that manifests with dlmalloc footers off
2022-04-14 23:39:48 -07:00
http://creativecommons.org/publicdomain/zero/1.0/
Make fixes, improvements, and chibicc python bindings - python now mixes audio 10x faster - python octal notation is restored - chibicc now builds code 3x faster - chibicc now has help documentation - chibicc can now generate basic python bindings - linenoise now supports some paredit-like features See #141
2021-10-08 08:11:51 -07:00
Improve synchronization - Fix bugs in kDos2Errno definition - malloc() should now be thread safe - Fix bug in rollup.com header generator - Fix open(O_APPEND) on the New Technology - Fix select() on the New Technology and test it - Work towards refactoring i/o for thread safety - Socket reads and writes on NT now poll for signals - Work towards i/o completion ports on the New Technology - Make read() and write() intermittently check for signals - Blinkenlights keyboard i/o so much better on NT w/ poll() - You can now poll() files and sockets at the same time on NT - Fix bug in appendr() that manifests with dlmalloc footers off
2022-04-14 23:39:48 -07:00
LOCAL CHANGES
Make fixes, improvements, and chibicc python bindings - python now mixes audio 10x faster - python octal notation is restored - chibicc now builds code 3x faster - chibicc now has help documentation - chibicc can now generate basic python bindings - linenoise now supports some paredit-like features See #141
2021-10-08 08:11:51 -07:00
Eliminate cyclic locks in runtime This change introduces a new deadlock detector for Cosmo's POSIX threads implementation. Error check mutexes will now track a DAG of nested locks and report EDEADLK when a deadlock is theoretically possible. These will occur rarely, but it's important for production hardening your code. You don't even need to change your mutexes to use the POSIX error check mode because `cosmocc -mdbg` will enable error checking on mutexes by default globally. When cycles are found, an error message showing your demangled symbols describing the strongly connected component are printed and then the SIGTRAP is raised, which means you'll also get a backtrace if you're using ShowCrashReports() too. This new error checker is so low-level and so pure that it's able to verify the relationships of every libc runtime lock, including those locks upon which the mutex implementation depends.
2024-12-16 20:51:27 -08:00
- Fix MT-safety bugs in DEBUG mode
Introduce ctl::set and ctl::map We now have a C++ red-black tree implementation that implements standard template library compatible APIs while compiling 10x faster than libcxx. It's not as beautiful as the red-black tree implementation in Plinko but this will get the job done and the test proves it upholds all invariants This change also restores CheckForMemoryLeaks() support and fixes a real actual bug I discovered with Doug Lea's dlmalloc_inspect_all() function.
2024-06-23 10:08:48 -07:00
- Fix bug in dlmalloc_inspect_all()
Rewrite memory manager Actually Portable Executable now supports Android. Cosmo's old mmap code required a 47 bit address space. The new implementation is very agnostic and supports both smaller address spaces (e.g. embedded) and even modern 56-bit PML5T paging for x86 which finally came true on Zen4 Threadripper Cosmopolitan no longer requires UNIX systems to observe the Windows 64kb granularity; i.e. sysconf(_SC_PAGE_SIZE) will now report the host native page size. This fixes a longstanding POSIX conformance issue, concerning file mappings that overlap the end of file. Other aspects of conformance have been improved too, such as the subtleties of address assignment and and the various subtleties surrounding MAP_FIXED and MAP_FIXED_NOREPLACE On Windows, mappings larger than 100 megabytes won't be broken down into thousands of independent 64kb mappings. Support for MAP_STACK is removed by this change; please use NewCosmoStack() instead. Stack overflow avoidance is now being implemented using the POSIX thread APIs. Please use GetStackBottom() and GetStackAddr(), instead of the old error-prone GetStackAddr() and HaveStackMemory() APIs which are removed.
2024-06-20 20:46:42 -07:00
- Define dlmalloc_requires_more_vespene_gas()
- Make dlmalloc scalable using sched_getcpu()
Always initialize thread local storage We had previously not enabled TLS in MODE=tiny in order to keep the smallest example programs (e.g. life.com) just 16kb in size. But it was error prone doing that, so now we just always enable it because this change uses hacks to ensure it won't increase life.com's size. This change also fixes a bug on NetBSD, where signal handlers would break thread local storage if SA_SIGINFO was being used. This looks like it might be a bug in NetBSD, but it's got a simple workaround.
2022-07-18 22:26:11 -07:00
- Use faster two power roundup for memalign()
Rewrite memory manager Actually Portable Executable now supports Android. Cosmo's old mmap code required a 47 bit address space. The new implementation is very agnostic and supports both smaller address spaces (e.g. embedded) and even modern 56-bit PML5T paging for x86 which finally came true on Zen4 Threadripper Cosmopolitan no longer requires UNIX systems to observe the Windows 64kb granularity; i.e. sysconf(_SC_PAGE_SIZE) will now report the host native page size. This fixes a longstanding POSIX conformance issue, concerning file mappings that overlap the end of file. Other aspects of conformance have been improved too, such as the subtleties of address assignment and and the various subtleties surrounding MAP_FIXED and MAP_FIXED_NOREPLACE On Windows, mappings larger than 100 megabytes won't be broken down into thousands of independent 64kb mappings. Support for MAP_STACK is removed by this change; please use NewCosmoStack() instead. Stack overflow avoidance is now being implemented using the POSIX thread APIs. Please use GetStackBottom() and GetStackAddr(), instead of the old error-prone GetStackAddr() and HaveStackMemory() APIs which are removed.
2024-06-20 20:46:42 -07:00
- Implemented the locking functions dlmalloc wants
- Use assembly _init() rather than ensure_initialization()
- Rather than calling mmap() 96 times from _start() just use .bss
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