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share: concurrency handling, easy updates

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Replace the `volatile int dirty` with a reference counter
protected by a mutex when available.

Solve the problem of when to call application's lock function
by adding a volatile flag that indicates a share has been added
to easy handles in its lifetime. That flag ever goes from
FALSE to TRUE, so volatile might work (in the absence of a mutex).

(The problem is that the lock/unlock functions need 2-3
`curl_share_setopt()` invocations to become usable and there
is no way of telling if the third will ever happen. Calling
the lock function before the 3rd setopt may crash the
application.)

When removing a share from an easy handle (or replacing it with
another share), detach the easy connection on a share with a
connection pool.

When cleaning up a share, allow this even if it is still used in
easy handles. It will be destroyed when the reference count
drops to 0.

Closes #20870
This commit is contained in:
Stefan Eissing 2026-03-09 15:40:34 +01:00 • committed by Daniel Stenberg
parent 745344ea4e
commit 82009c4220
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26 changed files with 378 additions and 210 deletions
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15
lib/curl_threads.h
View file

@ -25,7 +25,11 @@
***************************************************************************/
#include "curl_setup.h"
#ifdef USE_THREADS_POSIX
#ifdef USE_MUTEX
#ifdef HAVE_THREADS_POSIX
#ifdef HAVE_PTHREAD_H
#include <pthread.h>
#endif
# define CURL_THREAD_RETURN_T unsigned int
# define CURL_STDCALL
# define curl_mutex_t pthread_mutex_t
@ -35,7 +39,7 @@
# define Curl_mutex_acquire(m) pthread_mutex_lock(m)
# define Curl_mutex_release(m) pthread_mutex_unlock(m)
# define Curl_mutex_destroy(m) pthread_mutex_destroy(m)
#elif defined(USE_THREADS_WIN32)
#elif defined(_WIN32)
# define CURL_THREAD_RETURN_T DWORD
# define CURL_STDCALL WINAPI
# define curl_mutex_t CRITICAL_SECTION
@ -45,9 +49,12 @@
# define Curl_mutex_acquire(m) EnterCriticalSection(m)
# define Curl_mutex_release(m) LeaveCriticalSection(m)
# define Curl_mutex_destroy(m) DeleteCriticalSection(m)
#else
#error neither HAVE_THREADS_POSIX nor _WIN32 defined
#endif
#endif /* USE_MUTEX */
#if defined(USE_THREADS_POSIX) || defined(USE_THREADS_WIN32)
#ifdef USE_THREADS
curl_thread_t Curl_thread_create(CURL_THREAD_RETURN_T
(CURL_STDCALL *func) (void *), void *arg);
@ -56,6 +63,6 @@ void Curl_thread_destroy(curl_thread_t *hnd);
int Curl_thread_join(curl_thread_t *hnd);
#endif /* USE_THREADS_POSIX || USE_THREADS_WIN32 */
#endif /* USE_THREADS */
#endif /* HEADER_CURL_THREADS_H */