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thread: rearrange thread context management

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Use a bit allocator for the allocation management of thread contexts,
instead of holding allocation information within the Thread_base objects,
which lead to race conditions in the past.

Moreover, extend the Thread_base class interface with the ability to
to add additional stacks to a thread, and associate the context they're
located in with the corresponding Thread_base object. Additional stacks
can be used to do user-level scheduling with stack switching, without breaking
Genode's API.

Fixes #1024
Fixes #1036
This commit is contained in:
Stefan Kalkowski
2014-01-24 12:06:21 +01:00
committed by Christian Helmuth
parent 66c5887bd3
commit 5447c406e5
25 changed files with 259 additions and 179 deletions
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8
base-linux/include/base/native_types.h
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@ -131,13 +131,15 @@ namespace Genode {
* Please update platform-specific files after changing these
* values, e.g., 'base-linux/src/platform/context_area.*.ld'.
*/
static addr_t context_area_virtual_base() { return 0x40000000UL; }
static addr_t context_area_virtual_size() { return 0x10000000UL; }
static constexpr addr_t context_area_virtual_base() {
return 0x40000000UL; }
static constexpr addr_t context_area_virtual_size() {
return 0x10000000UL; }
/**
* Size of virtual address region holding the context of one thread
*/
static addr_t context_virtual_size() { return 0x00100000UL; }
static constexpr addr_t context_virtual_size() { return 0x00100000UL; }
};
class Native_pd_args