- 11 Oct, 2020 4 commits
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We want to store a pointer to emulate `pthread_exit` on Windows. Do this within the threading infrastructure so that it could potentially be re-used outside of the context of libgit2 itself.
Edward Thomson committed -
Our "global initialization" has accumulated some debris over the years. It was previously responsible for both running the various global initializers (that set up various subsystems) _and_ setting up the "global state", which is actually the thread-local state for things like error reporting. Separate the thread local state out into "threadstate". Use the normal subsystem initialization functions that we already have to set it up. This makes both the global initialization system and the threadstate system simpler to reason about.
Edward Thomson committed -
Move the mwindow mutex into the mwindow code itself, initializing it in the mwindow global initialization function instead of in the global initializer.
Edward Thomson committed -
Move the settings global data teardown into its own separate function, instead of intermingled with the global state.
Edward Thomson committed
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- 29 Nov, 2019 1 commit
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On Windows platforms, we automatically clean up the thread-local storage upon detaching a thread via `DllMain()`. The thing is that this happens for every thread of applications that link against the libgit2 DLL, even those that don't have anything to do with libgit2 itself. As a result, we cannot assume that these unsuspecting threads make use of our `git_libgit2_init()` and `git_libgit2_shutdow()` reference counting, which may lead to racy situations: Thread 1 Thread 2 git_libgit2_shutdown() DllMain(DETACH_THREAD) git__free_tls_data() git_atomic_dec() == 0 git__free_tls_data() TlsFree(_tls_index) TlsGetValue(_tls_index) Due to the second thread never having executed `git_libgit2_init()`, the first thread will clean up TLS data and as a result also free the `_tls_index` variable. When detaching the second thread, we unconditionally access the now-free'd `_tls_index` variable, which is obviously not going to work out well. Fix the issue by converting the code to use fiber-local storage instead of thread-local storage. While FLS will behave the exact same as TLS if no fibers are in use, it does allow us to specify a destructor similar to the one that is accepted by pthread_key_create(3P). Like this, we do not have to manually free indices anymore, but will let the FLS handle calling the destructor. This allows us to get rid of `DllMain()` completely, as we only used it to keep track of when threads were exiting and results in an overall simplification of TLS cleanup.
Patrick Steinhardt committed
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- 23 Oct, 2017 1 commit
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Etienne Samson committed
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- 03 Jul, 2017 1 commit
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Next to including several files, our "common.h" header also declares various macros which are then used throughout the project. As such, we have to make sure to always include this file first in all implementation files. Otherwise, we might encounter problems or even silent behavioural differences due to macros or defines not being defined as they should be. So in fact, our header and implementation files should make sure to always include "common.h" first. This commit does so by establishing a common include pattern. Header files inside of "src" will now always include "common.h" as its first other file, separated by a newline from all the other includes to make it stand out as special. There are two cases for the implementation files. If they do have a matching header file, they will always include this one first, leading to "common.h" being transitively included as first file. If they do not have a matching header file, they instead include "common.h" as first file themselves. This fixes the outlined problems and will become our standard practice for header and source files inside of the "src/" from now on.
Patrick Steinhardt committed
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- 18 Nov, 2016 1 commit
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Introduce `git_thread_exit`, which will allow threads to terminate at an arbitrary time, returning a `void *`. On Windows, this means that we need to store the current `git_thread` in TLS, so that we can set its `return` value when terminating. We cannot simply use `ExitThread`, since Win32 returns `DWORD`s from threads; we return `void *`.
Edward Thomson committed
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- 14 Mar, 2016 1 commit
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This ensures that when using OpenSSL a safe default set of ciphers is selected. This is done so that the client communicates securely and we don't accidentally enable unsafe ciphers like RC4, or even worse some old export ciphers. Implements the first part of https://github.com/libgit2/libgit2/issues/3682
Dirkjan Bussink committed
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- 12 Nov, 2015 1 commit
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Carlos Martín Nieto committed
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- 28 Jul, 2015 1 commit
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Instead of allocating a brand new buffer for each error string we want to store, we can use a per-thread buffer to store the error string and re-use the underlying storage. We already use the buffer to format the string, so this mostly makes that more direct.
Carlos Martín Nieto committed
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- 23 Apr, 2015 1 commit
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This is what it's meant all along, but now we actually have multiple implementations, it's clearer to use the name of the library.
Carlos Martín Nieto committed
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- 18 Apr, 2015 1 commit
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Jeff Hostetler committed
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- 17 Apr, 2015 1 commit
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Jeff Hostetler committed
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- 16 Sep, 2014 1 commit
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Ciro Santilli committed
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- 18 Aug, 2014 1 commit
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The old `allocfmt` is of no use to callers, as they are not able to free the returned buffer. Export a new API that returns a static string that doesn't need to be freed.
Vicent Marti committed
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- 12 Jun, 2014 2 commits
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Bring together all of the OpenSSL initialization to git_threads_init() so it's together and doesn't need locks. Moving it here also gives us libssh2 thread safety (when built against openssl).
Carlos Martín Nieto committed -
OpenSSL's tests init everything in the main thread, so let's do that.
Carlos Martín Nieto committed
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- 11 Jun, 2014 1 commit
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The OpenSSL init functions are not reentrant, which means that running multiple fetches in parallel can cause us to crash. Use a mutex to init OpenSSL, and since we're adding this extra checks, init it only once.
Carlos Martín Nieto committed
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- 17 Sep, 2013 1 commit
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Increasingly there are a number of components that want to do some cleanup at global shutdown time (at least if there are not going to be memory leaks). This creates a very simple system of shutdown hooks that will be invoked by git_threads_shutdown. Right now, the maximum number of hooks is hardcoded, but since adding a hook is not a public API, it should be fine and I thought it was better to start off with really simple code.
Russell Belfer committed
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- 22 Apr, 2013 1 commit
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This removes the lock from the repository object and changes the internals to use the new atomic git__compare_and_swap to update the _odb, _config, _index, and _refdb variables in a threadsafe manner.
Russell Belfer committed
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- 08 Jan, 2013 1 commit
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Edward Thomson committed
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- 13 Nov, 2012 3 commits
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Edward Thomson committed
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Edward Thomson committed
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Edward Thomson committed
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- 20 Aug, 2012 1 commit
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Up to now, the idea was that the user would do all the operations for one repository in the same thread. Thus we could have the memory-mapped window information thread-local and avoid any locking. This is not practical in a few environments, such as Apple's GCD which allocates threads arbitrarily or the .NET CLR, where the OS-level thread can change at any moment. Make the control structure global and protect it with a mutex so we don't depend on the thread currently executing the code.
Carlos Martín Nieto committed
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- 17 Jul, 2012 1 commit
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Michael Schubert committed
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- 05 Mar, 2012 1 commit
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Yes, this is error handling solely for `refs.c`, but some of the abstractions leak all ofer the code base.
Vicent Martí committed
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- 13 Feb, 2012 1 commit
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Signed-off-by: schu <schu-github@schulog.org>
schu committed
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- 16 Nov, 2011 1 commit
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See `global.c` for a description of what we're doing. When libgit2 is built with GIT_THREADS support, the threading system must be explicitly initialized with `git_threads_init()`.
Vicent Marti committed
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