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Rework the internal lock interface

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With this patch, the 'futex' syscall gets used for blocking and unblocking
of threads in the Linux-specific lock implementation.

The 'Native_thread_id' type, which was previously used in the
lock-internal 'Applicant' class to identify a thread to be woken up,
was not suitable anymore for implementing this change. With this patch,
the 'Thread_base*' type gets used instead, which also has the positive
effect of making the public 'cancelable_lock.h' header file
platform-independent.

Fixes #646.
This commit is contained in:
Christian Prochaska
2013-02-25 21:18:26 +01:00
committed by Norman Feske
parent 7fef0ba931
commit a99193ad90
36 changed files with 496 additions and 330 deletions
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12
base-linux/include/base/native_types.h
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@ -29,10 +29,9 @@
namespace Genode {
/**
* Thread ID used in lock implementation
* Thread ID
*
* Unfortunately, both - PID and TID - are needed for lx_tgkill() in
* thread_check_stopped_and_restart().
* Unfortunately, both - PID and TID - are needed for lx_tgkill()
*/
struct Native_thread_id
{
@ -62,6 +61,11 @@ namespace Genode {
{
bool is_ipc_server;
/**
* Natively aligned memory location used in the lock implementation
*/
int futex_counter __attribute__((aligned(sizeof(Genode::addr_t))));
/**
* Opaque pointer to additional thread-specific meta data
*
@ -71,7 +75,7 @@ namespace Genode {
*/
Thread_meta_data *meta_data;
Native_thread() : is_ipc_server(false), meta_data(0) { }
Native_thread() : is_ipc_server(false), futex_counter(0), meta_data(0) { }
};
inline bool operator == (Native_thread_id t1, Native_thread_id t2) {