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-rw-r--r--mysys/my_context.c761
1 files changed, 0 insertions, 761 deletions
diff --git a/mysys/my_context.c b/mysys/my_context.c
deleted file mode 100644
index 5423f59d19b..00000000000
--- a/mysys/my_context.c
+++ /dev/null
@@ -1,761 +0,0 @@
-/*
- Copyright 2011, 2012 Kristian Nielsen and Monty Program Ab
-
- This file is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-/*
- Implementation of async context spawning using Posix ucontext and
- swapcontext().
-*/
-
-#include "mysys_priv.h"
-#include "m_string.h"
-#include "my_context.h"
-
-#ifdef HAVE_VALGRIND_MEMCHECK_H
-#include <valgrind/valgrind.h>
-#endif
-
-#ifdef MY_CONTEXT_USE_UCONTEXT
-/*
- The makecontext() only allows to pass integers into the created context :-(
- We want to pass pointers, so we do it this kinda hackish way.
- Anyway, it should work everywhere, and at least it does not break strict
- aliasing.
-*/
-union pass_void_ptr_as_2_int {
- int a[2];
- void *p;
-};
-
-
-/*
- We use old-style function definition here, as this is passed to
- makecontext(). And the type of the makecontext() argument does not match
- the actual type (as the actual type can differ from call to call).
-*/
-static void
-my_context_spawn_internal(i0, i1)
-int i0, i1;
-{
- int err;
- struct my_context *c;
- union pass_void_ptr_as_2_int u;
-
- u.a[0]= i0;
- u.a[1]= i1;
- c= (struct my_context *)u.p;
-
- (*c->user_func)(c->user_data);
- c->active= 0;
- err= setcontext(&c->base_context);
- fprintf(stderr, "Aieie, setcontext() failed: %d (errno=%d)\n", err, errno);
-}
-
-
-int
-my_context_continue(struct my_context *c)
-{
- int err;
-
- if (!c->active)
- return 0;
-
- DBUG_SWAP_CODE_STATE(&c->dbug_state);
- err= swapcontext(&c->base_context, &c->spawned_context);
- DBUG_SWAP_CODE_STATE(&c->dbug_state);
- if (err)
- {
- fprintf(stderr, "Aieie, swapcontext() failed: %d (errno=%d)\n",
- err, errno);
- return -1;
- }
-
- return c->active;
-}
-
-
-int
-my_context_spawn(struct my_context *c, void (*f)(void *), void *d)
-{
- int err;
- union pass_void_ptr_as_2_int u;
-
- err= getcontext(&c->spawned_context);
- if (err)
- return -1;
- c->spawned_context.uc_stack.ss_sp= c->stack;
- c->spawned_context.uc_stack.ss_size= c->stack_size;
- c->spawned_context.uc_link= NULL;
- c->user_func= f;
- c->user_data= d;
- c->active= 1;
- u.p= c;
- makecontext(&c->spawned_context, my_context_spawn_internal, 2,
- u.a[0], u.a[1]);
-
- return my_context_continue(c);
-}
-
-
-int
-my_context_yield(struct my_context *c)
-{
- int err;
-
- if (!c->active)
- return -1;
-
- err= swapcontext(&c->spawned_context, &c->base_context);
- if (err)
- return -1;
- return 0;
-}
-
-int
-my_context_init(struct my_context *c, size_t stack_size)
-{
-#if SIZEOF_CHARP > SIZEOF_INT*2
-#error Error: Unable to store pointer in 2 ints on this architecture
-#endif
- bzero(c, sizeof(*c));
- if (!(c->stack= malloc(stack_size)))
- return -1; /* Out of memory */
- c->stack_size= stack_size;
-#ifdef HAVE_VALGRIND_MEMCHECK_H
- c->valgrind_stack_id=
- VALGRIND_STACK_REGISTER(c->stack, ((unsigned char *)(c->stack))+stack_size);
-#endif
- return 0;
-}
-
-void
-my_context_destroy(struct my_context *c)
-{
- if (c->stack)
- {
-#ifdef HAVE_VALGRIND_MEMCHECK_H
- VALGRIND_STACK_DEREGISTER(c->valgrind_stack_id);
-#endif
- free(c->stack);
- }
- DBUG_FREE_CODE_STATE(&c->dbug_state);
-}
-
-#endif /* MY_CONTEXT_USE_UCONTEXT */
-
-
-#ifdef MY_CONTEXT_USE_X86_64_GCC_ASM
-/*
- GCC-amd64 implementation of my_context.
-
- This is slightly optimized in the common case where we never yield
- (eg. fetch next row and it is already fully received in buffer). In this
- case we do not need to restore registers at return (though we still need to
- save them as we cannot know if we will yield or not in advance).
-*/
-
-#include <stdint.h>
-#include <stdlib.h>
-
-/*
- Layout of saved registers etc.
- Since this is accessed through gcc inline assembler, it is simpler to just
- use numbers than to try to define nice constants or structs.
-
- 0 0 %rsp
- 1 8 %rbp
- 2 16 %rbx
- 3 24 %r12
- 4 32 %r13
- 5 40 %r14
- 6 48 %r15
- 7 56 %rip for done
- 8 64 %rip for yield/continue
-*/
-
-int
-my_context_spawn(struct my_context *c, void (*f)(void *), void *d)
-{
- int ret;
-
- DBUG_SWAP_CODE_STATE(&c->dbug_state);
-
- /*
- There are 6 callee-save registers we need to save and restore when
- suspending and continuing, plus stack pointer %rsp and instruction pointer
- %rip.
-
- However, if we never suspend, the user-supplied function will in any case
- restore the 6 callee-save registers, so we can avoid restoring them in
- this case.
- */
- __asm__ __volatile__
- (
- "movq %%rsp, (%[save])\n\t"
- "movq %[stack], %%rsp\n\t"
-#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4) || __clang__) && \
- !defined(__INTEL_COMPILER)
- /*
- This emits a DWARF DW_CFA_undefined directive to make the return address
- undefined. This indicates that this is the top of the stack frame, and
- helps tools that use DWARF stack unwinding to obtain stack traces.
- (I use numeric constant to avoid a dependency on libdwarf includes).
- */
- ".cfi_escape 0x07, 16\n\t"
-#endif
- "movq %%rbp, 8(%[save])\n\t"
- "movq %%rbx, 16(%[save])\n\t"
- "movq %%r12, 24(%[save])\n\t"
- "movq %%r13, 32(%[save])\n\t"
- "movq %%r14, 40(%[save])\n\t"
- "movq %%r15, 48(%[save])\n\t"
- "leaq 1f(%%rip), %%rax\n\t"
- "leaq 2f(%%rip), %%rcx\n\t"
- "movq %%rax, 56(%[save])\n\t"
- "movq %%rcx, 64(%[save])\n\t"
- /*
- Constraint below puts the argument to the user function into %rdi, as
- needed for the calling convention.
- */
- "callq *%[f]\n\t"
- "jmpq *56(%[save])\n"
- /*
- Come here when operation is done.
- We do not need to restore callee-save registers, as the called function
- will do this for us if needed.
- */
- "1:\n\t"
- "movq (%[save]), %%rsp\n\t"
- "xorl %[ret], %[ret]\n\t"
- "jmp 3f\n"
- /* Come here when operation was suspended. */
- "2:\n\t"
- "movl $1, %[ret]\n"
- "3:\n"
- : [ret] "=a" (ret),
- [f] "+S" (f),
- /* Need this in %rdi to follow calling convention. */
- [d] "+D" (d)
- : [stack] "a" (c->stack_top),
- /* Need this in callee-save register to preserve in function call. */
- [save] "b" (&c->save[0])
- : "rcx", "rdx", "r8", "r9", "r10", "r11", "memory", "cc"
- );
-
- DBUG_SWAP_CODE_STATE(&c->dbug_state);
-
- return ret;
-}
-
-int
-my_context_continue(struct my_context *c)
-{
- int ret;
-
- DBUG_SWAP_CODE_STATE(&c->dbug_state);
-
- __asm__ __volatile__
- (
- "movq (%[save]), %%rax\n\t"
- "movq %%rsp, (%[save])\n\t"
- "movq %%rax, %%rsp\n\t"
- "movq 8(%[save]), %%rax\n\t"
- "movq %%rbp, 8(%[save])\n\t"
- "movq %%rax, %%rbp\n\t"
- "movq 24(%[save]), %%rax\n\t"
- "movq %%r12, 24(%[save])\n\t"
- "movq %%rax, %%r12\n\t"
- "movq 32(%[save]), %%rax\n\t"
- "movq %%r13, 32(%[save])\n\t"
- "movq %%rax, %%r13\n\t"
- "movq 40(%[save]), %%rax\n\t"
- "movq %%r14, 40(%[save])\n\t"
- "movq %%rax, %%r14\n\t"
- "movq 48(%[save]), %%rax\n\t"
- "movq %%r15, 48(%[save])\n\t"
- "movq %%rax, %%r15\n\t"
-
- "leaq 1f(%%rip), %%rax\n\t"
- "leaq 2f(%%rip), %%rcx\n\t"
- "movq %%rax, 56(%[save])\n\t"
- "movq 64(%[save]), %%rax\n\t"
- "movq %%rcx, 64(%[save])\n\t"
-
- "movq 16(%[save]), %%rcx\n\t"
- "movq %%rbx, 16(%[save])\n\t"
- "movq %%rcx, %%rbx\n\t"
-
- "jmpq *%%rax\n"
- /*
- Come here when operation is done.
- Be sure to use the same callee-save register for %[save] here and in
- my_context_spawn(), so we preserve the value correctly at this point.
- */
- "1:\n\t"
- "movq (%[save]), %%rsp\n\t"
- "movq 8(%[save]), %%rbp\n\t"
- /* %rbx is preserved from my_context_spawn() in this case. */
- "movq 24(%[save]), %%r12\n\t"
- "movq 32(%[save]), %%r13\n\t"
- "movq 40(%[save]), %%r14\n\t"
- "movq 48(%[save]), %%r15\n\t"
- "xorl %[ret], %[ret]\n\t"
- "jmp 3f\n"
- /* Come here when operation is suspended. */
- "2:\n\t"
- "movl $1, %[ret]\n"
- "3:\n"
- : [ret] "=a" (ret)
- : /* Need this in callee-save register to preserve in function call. */
- [save] "b" (&c->save[0])
- : "rcx", "rdx", "rsi", "rdi", "r8", "r9", "r10", "r11", "memory", "cc"
- );
-
- DBUG_SWAP_CODE_STATE(&c->dbug_state);
-
- return ret;
-}
-
-int
-my_context_yield(struct my_context *c)
-{
- uint64_t *save= &c->save[0];
- __asm__ __volatile__
- (
- "movq (%[save]), %%rax\n\t"
- "movq %%rsp, (%[save])\n\t"
- "movq %%rax, %%rsp\n\t"
- "movq 8(%[save]), %%rax\n\t"
- "movq %%rbp, 8(%[save])\n\t"
- "movq %%rax, %%rbp\n\t"
- "movq 16(%[save]), %%rax\n\t"
- "movq %%rbx, 16(%[save])\n\t"
- "movq %%rax, %%rbx\n\t"
- "movq 24(%[save]), %%rax\n\t"
- "movq %%r12, 24(%[save])\n\t"
- "movq %%rax, %%r12\n\t"
- "movq 32(%[save]), %%rax\n\t"
- "movq %%r13, 32(%[save])\n\t"
- "movq %%rax, %%r13\n\t"
- "movq 40(%[save]), %%rax\n\t"
- "movq %%r14, 40(%[save])\n\t"
- "movq %%rax, %%r14\n\t"
- "movq 48(%[save]), %%rax\n\t"
- "movq %%r15, 48(%[save])\n\t"
- "movq %%rax, %%r15\n\t"
- "movq 64(%[save]), %%rax\n\t"
- "leaq 1f(%%rip), %%rcx\n\t"
- "movq %%rcx, 64(%[save])\n\t"
-
- "jmpq *%%rax\n"
-
- "1:\n"
- : [save] "+D" (save)
- :
- : "rax", "rcx", "rdx", "rsi", "r8", "r9", "r10", "r11", "memory", "cc"
- );
- return 0;
-}
-
-int
-my_context_init(struct my_context *c, size_t stack_size)
-{
- bzero(c, sizeof(*c));
-
- if (!(c->stack_bot= malloc(stack_size)))
- return -1; /* Out of memory */
- /*
- The x86_64 ABI specifies 16-byte stack alignment.
- Also put two zero words at the top of the stack.
- */
- c->stack_top= (void *)
- (( ((intptr)c->stack_bot + stack_size) & ~(intptr)0xf) - 16);
- bzero(c->stack_top, 16);
-
-#ifdef HAVE_VALGRIND_MEMCHECK_H
- c->valgrind_stack_id=
- VALGRIND_STACK_REGISTER(c->stack_bot, c->stack_top);
-#endif
- return 0;
-}
-
-void
-my_context_destroy(struct my_context *c)
-{
- if (c->stack_bot)
- {
- free(c->stack_bot);
-#ifdef HAVE_VALGRIND_MEMCHECK_H
- VALGRIND_STACK_DEREGISTER(c->valgrind_stack_id);
-#endif
- }
- DBUG_FREE_CODE_STATE(&c->dbug_state);
-}
-
-#endif /* MY_CONTEXT_USE_X86_64_GCC_ASM */
-
-
-#ifdef MY_CONTEXT_USE_I386_GCC_ASM
-/*
- GCC-i386 implementation of my_context.
-
- This is slightly optimized in the common case where we never yield
- (eg. fetch next row and it is already fully received in buffer). In this
- case we do not need to restore registers at return (though we still need to
- save them as we cannot know if we will yield or not in advance).
-*/
-
-#include <stdint.h>
-#include <stdlib.h>
-
-/*
- Layout of saved registers etc.
- Since this is accessed through gcc inline assembler, it is simpler to just
- use numbers than to try to define nice constants or structs.
-
- 0 0 %esp
- 1 4 %ebp
- 2 8 %ebx
- 3 12 %esi
- 4 16 %edi
- 5 20 %eip for done
- 6 24 %eip for yield/continue
-*/
-
-int
-my_context_spawn(struct my_context *c, void (*f)(void *), void *d)
-{
- int ret;
-
- DBUG_SWAP_CODE_STATE(&c->dbug_state);
-
- /*
- There are 4 callee-save registers we need to save and restore when
- suspending and continuing, plus stack pointer %esp and instruction pointer
- %eip.
-
- However, if we never suspend, the user-supplied function will in any case
- restore the 4 callee-save registers, so we can avoid restoring them in
- this case.
- */
- __asm__ __volatile__
- (
- "movl %%esp, (%[save])\n\t"
- "movl %[stack], %%esp\n\t"
-#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)) && !defined(__INTEL_COMPILER)
- /*
- This emits a DWARF DW_CFA_undefined directive to make the return address
- undefined. This indicates that this is the top of the stack frame, and
- helps tools that use DWARF stack unwinding to obtain stack traces.
- (I use numeric constant to avoid a dependency on libdwarf includes).
- */
- ".cfi_escape 0x07, 8\n\t"
-#endif
- /* Push the parameter on the stack. */
- "pushl %[d]\n\t"
- "movl %%ebp, 4(%[save])\n\t"
- "movl %%ebx, 8(%[save])\n\t"
- "movl %%esi, 12(%[save])\n\t"
- "movl %%edi, 16(%[save])\n\t"
- /* Get label addresses in -fPIC-compatible way (no pc-relative on 32bit) */
- "call 1f\n"
- "1:\n\t"
- "popl %%eax\n\t"
- "addl $(2f-1b), %%eax\n\t"
- "movl %%eax, 20(%[save])\n\t"
- "addl $(3f-2f), %%eax\n\t"
- "movl %%eax, 24(%[save])\n\t"
- "call *%[f]\n\t"
- "jmp *20(%[save])\n"
- /*
- Come here when operation is done.
- We do not need to restore callee-save registers, as the called function
- will do this for us if needed.
- */
- "2:\n\t"
- "movl (%[save]), %%esp\n\t"
- "xorl %[ret], %[ret]\n\t"
- "jmp 4f\n"
- /* Come here when operation was suspended. */
- "3:\n\t"
- "movl $1, %[ret]\n"
- "4:\n"
- : [ret] "=a" (ret),
- [f] "+c" (f),
- [d] "+d" (d)
- : [stack] "a" (c->stack_top),
- /* Need this in callee-save register to preserve across function call. */
- [save] "D" (&c->save[0])
- : "memory", "cc"
- );
-
- DBUG_SWAP_CODE_STATE(&c->dbug_state);
-
- return ret;
-}
-
-int
-my_context_continue(struct my_context *c)
-{
- int ret;
-
- DBUG_SWAP_CODE_STATE(&c->dbug_state);
-
- __asm__ __volatile__
- (
- "movl (%[save]), %%eax\n\t"
- "movl %%esp, (%[save])\n\t"
- "movl %%eax, %%esp\n\t"
- "movl 4(%[save]), %%eax\n\t"
- "movl %%ebp, 4(%[save])\n\t"
- "movl %%eax, %%ebp\n\t"
- "movl 8(%[save]), %%eax\n\t"
- "movl %%ebx, 8(%[save])\n\t"
- "movl %%eax, %%ebx\n\t"
- "movl 12(%[save]), %%eax\n\t"
- "movl %%esi, 12(%[save])\n\t"
- "movl %%eax, %%esi\n\t"
-
- "movl 24(%[save]), %%eax\n\t"
- "call 1f\n"
- "1:\n\t"
- "popl %%ecx\n\t"
- "addl $(2f-1b), %%ecx\n\t"
- "movl %%ecx, 20(%[save])\n\t"
- "addl $(3f-2f), %%ecx\n\t"
- "movl %%ecx, 24(%[save])\n\t"
-
- /* Must restore %edi last as it is also our %[save] register. */
- "movl 16(%[save]), %%ecx\n\t"
- "movl %%edi, 16(%[save])\n\t"
- "movl %%ecx, %%edi\n\t"
-
- "jmp *%%eax\n"
- /*
- Come here when operation is done.
- Be sure to use the same callee-save register for %[save] here and in
- my_context_spawn(), so we preserve the value correctly at this point.
- */
- "2:\n\t"
- "movl (%[save]), %%esp\n\t"
- "movl 4(%[save]), %%ebp\n\t"
- "movl 8(%[save]), %%ebx\n\t"
- "movl 12(%[save]), %%esi\n\t"
- "movl 16(%[save]), %%edi\n\t"
- "xorl %[ret], %[ret]\n\t"
- "jmp 4f\n"
- /* Come here when operation is suspended. */
- "3:\n\t"
- "movl $1, %[ret]\n"
- "4:\n"
- : [ret] "=a" (ret)
- : /* Need this in callee-save register to preserve in function call. */
- [save] "D" (&c->save[0])
- : "ecx", "edx", "memory", "cc"
- );
-
- DBUG_SWAP_CODE_STATE(&c->dbug_state);
-
- return ret;
-}
-
-int
-my_context_yield(struct my_context *c)
-{
- uint64_t *save= &c->save[0];
- __asm__ __volatile__
- (
- "movl (%[save]), %%eax\n\t"
- "movl %%esp, (%[save])\n\t"
- "movl %%eax, %%esp\n\t"
- "movl 4(%[save]), %%eax\n\t"
- "movl %%ebp, 4(%[save])\n\t"
- "movl %%eax, %%ebp\n\t"
- "movl 8(%[save]), %%eax\n\t"
- "movl %%ebx, 8(%[save])\n\t"
- "movl %%eax, %%ebx\n\t"
- "movl 12(%[save]), %%eax\n\t"
- "movl %%esi, 12(%[save])\n\t"
- "movl %%eax, %%esi\n\t"
- "movl 16(%[save]), %%eax\n\t"
- "movl %%edi, 16(%[save])\n\t"
- "movl %%eax, %%edi\n\t"
-
- "movl 24(%[save]), %%eax\n\t"
- "call 1f\n"
- "1:\n\t"
- "popl %%ecx\n\t"
- "addl $(2f-1b), %%ecx\n\t"
- "movl %%ecx, 24(%[save])\n\t"
-
- "jmp *%%eax\n"
-
- "2:\n"
- : [save] "+d" (save)
- :
- : "eax", "ecx", "memory", "cc"
- );
- return 0;
-}
-
-int
-my_context_init(struct my_context *c, size_t stack_size)
-{
- bzero(c, sizeof(*c));
- if (!(c->stack_bot= malloc(stack_size)))
- return -1; /* Out of memory */
- c->stack_top= (void *)
- (( ((intptr)c->stack_bot + stack_size) & ~(intptr)0xf) - 16);
- bzero(c->stack_top, 16);
-
-#ifdef HAVE_VALGRIND_MEMCHECK_H
- c->valgrind_stack_id=
- VALGRIND_STACK_REGISTER(c->stack_bot, c->stack_top);
-#endif
- return 0;
-}
-
-void
-my_context_destroy(struct my_context *c)
-{
- if (c->stack_bot)
- {
- free(c->stack_bot);
-#ifdef HAVE_VALGRIND_MEMCHECK_H
- VALGRIND_STACK_DEREGISTER(c->valgrind_stack_id);
-#endif
- }
- DBUG_FREE_CODE_STATE(&c->dbug_state);
-}
-
-#endif /* MY_CONTEXT_USE_I386_GCC_ASM */
-
-
-#ifdef MY_CONTEXT_USE_WIN32_FIBERS
-int
-my_context_yield(struct my_context *c)
-{
- c->return_value= 1;
- SwitchToFiber(c->app_fiber);
- return 0;
-}
-
-
-static void WINAPI
-my_context_trampoline(void *p)
-{
- struct my_context *c= (struct my_context *)p;
- /*
- Reuse the Fiber by looping infinitely, each time we are scheduled we
- spawn the appropriate function and switch back when it is done.
-
- This way we avoid the overhead of CreateFiber() for every asynchroneous
- operation.
- */
- for(;;)
- {
- (*(c->user_func))(c->user_arg);
- c->return_value= 0;
- SwitchToFiber(c->app_fiber);
- }
-}
-
-int
-my_context_init(struct my_context *c, size_t stack_size)
-{
- bzero(c, sizeof(*c));
- c->lib_fiber= CreateFiber(stack_size, my_context_trampoline, c);
- if (c->lib_fiber)
- return 0;
- return -1;
-}
-
-void
-my_context_destroy(struct my_context *c)
-{
- DBUG_FREE_CODE_STATE(&c->dbug_state);
- if (c->lib_fiber)
- {
- DeleteFiber(c->lib_fiber);
- c->lib_fiber= NULL;
- }
-}
-
-int
-my_context_spawn(struct my_context *c, void (*f)(void *), void *d)
-{
- c->user_func= f;
- c->user_arg= d;
- return my_context_continue(c);
-}
-
-int
-my_context_continue(struct my_context *c)
-{
- /*
- This seems to be a common trick to run ConvertThreadToFiber() only on the
- first occurrence in a thread, in a way that works on multiple Windows
- versions.
- */
- void *current_fiber= GetCurrentFiber();
- if (current_fiber == NULL || current_fiber == (void *)0x1e00)
- current_fiber= ConvertThreadToFiber(c);
- c->app_fiber= current_fiber;
- DBUG_SWAP_CODE_STATE(&c->dbug_state);
- SwitchToFiber(c->lib_fiber);
- DBUG_SWAP_CODE_STATE(&c->dbug_state);
-
- return c->return_value;
-}
-
-#endif /* MY_CONTEXT_USE_WIN32_FIBERS */
-
-#ifdef MY_CONTEXT_DISABLE
-int
-my_context_continue(struct my_context *c __attribute__((unused)))
-{
- return -1;
-}
-
-
-int
-my_context_spawn(struct my_context *c __attribute__((unused)),
- void (*f)(void *) __attribute__((unused)),
- void *d __attribute__((unused)))
-{
- return -1;
-}
-
-
-int
-my_context_yield(struct my_context *c __attribute__((unused)))
-{
- return -1;
-}
-
-int
-my_context_init(struct my_context *c __attribute__((unused)),
- size_t stack_size __attribute__((unused)))
-{
- return -1; /* Out of memory */
-}
-
-void
-my_context_destroy(struct my_context *c __attribute__((unused)))
-{
-}
-
-#endif
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