Subversion Repositories Kolibri OS

$Revision: 6089 $

align 4

;struct futex*  __fastcall create_futex(int *ptr)

create_futex:

        push    ecx

        mov     ecx, sizeof.FUTEX

        call    create_object

        pop     ecx

        test    eax, eax

        jz      .fail

        mov     [eax+FUTEX.magic], 'FUTX'

        mov     [eax+FUTEX.destroy], 0

        mov     [eax+FUTEX.pointer], ecx

        lea     ecx, [eax+FUTEX.wait_list]

        list_init ecx

        mov     [eax+FUTEX.flags], 0

.fail:

        ret

align 4

;int __fastcall destroy_futex(struct futex *futex)

destroy_futex:

        push    esi

        mov     esi, [current_process]

        mov     edx, [ecx+FUTEX.handle]

        pushfd

        cli

        lea     eax, [ecx+FUTEX.wait_list]

        cmp     eax, [eax+LHEAD.next]

        jne     .fail

        mov     eax, [esi+PROC.ht_next]

        mov     [esi+PROC.htab+edx*4], eax

        mov     [esi+PROC.ht_next], edx

        inc     [esi+PROC.ht_free]

        popfd

        pop     esi

        mov     eax, ecx

        call    free

        xor     eax, eax

        ret

.fail:

        popfd

        pop     esi

        mov     eax, -1

        ret

iglobal

align 4

f77call:

        dd f77.futex_init     ;0

        dd f77.futex_destroy  ;1

        dd f77.futex_wait     ;2

        dd f77.futex_wake     ;3

.end:

endg

align 4

sys_synchronization:

f77:

        test    ebx, ebx

        jz      .futex_init

        cmp     ebx, (f77call.end-f77call)/4

        jae     .fail

        cmp     ecx, STDERR_FILENO

        jbe     .fail

        cmp     ecx, (PROC.pdt_0 - PROC.htab)/4

        jae     .fail

        mov     edi, [current_process]

        mov     ebp, [edi+PROC.htab+ecx*4]

        cmp     [ebp+FUTEX.magic], 'FUTX'

        jne     .fail

        cmp     [ebp+FUTEX.handle], ecx

        jne     .fail

        jmp     dword [f77call+ebx*4]

.fail:

        mov     [esp+SYSCALL_STACK._eax], -1

        ret

align 4

.futex_init:

        call    create_futex

        test    eax, eax

        jz      @F

        mov     eax, [eax+FUTEX.handle]

@@:

        mov     [esp+SYSCALL_STACK._eax], eax

        ret

align 4

;ecx futex handle

;edi current process

;ebp futex object

.futex_destroy:

        mov     ecx, ebp

        call    destroy_futex

        mov     [esp+SYSCALL_STACK._eax], eax

        ret

align 4

;ecx futex handle

;edx control value

;esi timeout

;edi current process

;ebp futex object

.futex_wait:

        test    esi, esi

        jnz     .futex_wait_timeout

        mov     ecx, [ebp+FUTEX.pointer]

        mov     eax, edx

        lock cmpxchg [ecx], edx

        je      .wait_slow

        mov     [esp+SYSCALL_STACK._eax], -2

        ret

.wait_slow:

        pushfd

        cli

        sub     esp, sizeof.MUTEX_WAITER

        mov     ebx, [TASK_BASE]

        mov     [esp+MUTEX_WAITER.task], ebx

        lea     esi, [ebp+FUTEX.wait_list]

        list_add_tail esp, esi      ;esp= new waiter, esi= list head

        mov     eax, edx

.again:

        mov     [ebx+TASKDATA.state], 1

        call    change_task

        lock cmpxchg [ecx], edx

        je      .again

        list_del esp

        add     esp, sizeof.MUTEX_WAITER

        popfd

        mov     [esp+SYSCALL_STACK._eax], 0

        ret

align 4

;ecx futex handle

;edx control value

;esi timeout

;edi current process

;ebp futex object

.futex_wait_timeout:

        mov     ecx, [ebp+FUTEX.pointer]

        mov     eax, edx

        lock cmpxchg [ecx], edx         ;wait until old_value == new_value

        je      .wait_slow_timeout

        mov     [esp+SYSCALL_STACK._eax], -2

        ret

align 4

.wait_test:

        xor     eax, eax

        ret

.wait_slow_timeout:

        pushfd

        cli

        sub     esp, sizeof.MUTEX_WAITER

        mov     ebx, [current_slot]

        mov     [ebx+APPDATA.wait_test], f77.wait_test

        mov     [ebx+APPDATA.wait_timeout], esi

        mov     [ebx+APPDATA.wait_param], ebp

        mov     eax, [timer_ticks]

        mov     [ebx+APPDATA.wait_begin], eax

        mov     eax, [TASK_BASE]

        mov     [eax+TASKDATA.state], 5

        mov     [esp+MUTEX_WAITER.task], eax

        lea     esi, [ebp+FUTEX.wait_list]

        list_add_tail esp, esi      ;esp= new waiter, esi= list head

.again_timeout:

        call    change_task

        mov     eax, [ebx+APPDATA.wait_param]

        test    eax, eax

        jz      .timeout

        mov     eax, edx

        lock cmpxchg [ecx], edx

        jz      .again_timeout

@@:

        list_del esp

        add     esp, sizeof.MUTEX_WAITER

        popfd

        mov     [esp+SYSCALL_STACK._eax], 0

        ret

.timeout:

        list_del esp

        add     esp, sizeof.MUTEX_WAITER

        popfd

        mov     [esp+SYSCALL_STACK._eax], -1

        ret

align 4

;ecx futex handle

;edx number of threads

;edi current process

;ebp futex object

.futex_wake:

        xor     ecx, ecx

        pushfd

        cli

        lea     ebx, [ebp+FUTEX.wait_list]

        mov     esi, [ebx+LHEAD.next]

.wake:

        cmp     esi, ebx

        je      .done

        mov     eax, [esi+MUTEX_WAITER.task]

        mov     [eax+TASKDATA.state], 0

        mov     esi, [esi+MUTEX_WAITER.list.next]

        inc     ecx

        cmp     ecx, edx

        jb      .wake

.done: