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Merge pull request #25927 from hpvb/fix-21725

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Fix alignment and locking issues with CommandQueueMT
This commit is contained in:
Rémi Verschelde 2019-02-16 12:51:17 +01:00 committed by GitHub
commit 274d7cd632
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 14 additions and 9 deletions
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4
core/command_queue_mt.cpp
View file

@ -97,7 +97,7 @@ tryagain:
return false;
}
dealloc_ptr += (size >> 1) + sizeof(uint32_t);
dealloc_ptr += (size >> 1) + 8;
return true;
}
@ -107,6 +107,7 @@ CommandQueueMT::CommandQueueMT(bool p_sync) {
write_ptr = 0;
dealloc_ptr = 0;
mutex = Mutex::create();
command_mem = (uint8_t *)memalloc(COMMAND_MEM_SIZE);
for (int i = 0; i < SYNC_SEMAPHORES; i++) {
@ -128,4 +129,5 @@ CommandQueueMT::~CommandQueueMT() {
memdelete(sync_sems[i].sem);
}
memfree(command_mem);
}

19
core/command_queue_mt.h
View file

@ -36,6 +36,7 @@
#include "core/os/semaphore.h"
#include "core/simple_type.h"
#include "core/typedefs.h"
/**
@author Juan Linietsky <reduzio@gmail.com>
*/
@ -254,6 +255,7 @@
unlock(); \
if (sync) sync->post(); \
ss->sem->wait(); \
ss->in_use = false; \
}
#define CMD_SYNC_TYPE(N) CommandSync##N<T, M COMMA(N) COMMA_SEP_LIST(TYPE_ARG, N)>
@ -270,6 +272,7 @@
unlock(); \
if (sync) sync->post(); \
ss->sem->wait(); \
ss->in_use = false; \
}
#define MAX_CMD_PARAMS 13
@ -295,7 +298,6 @@ class CommandQueueMT {
virtual void post() {
sync_sem->sem->post();
sync_sem->in_use = false;
}
};
@ -318,7 +320,7 @@ class CommandQueueMT {
SYNC_SEMAPHORES = 8
};
uint8_t command_mem[COMMAND_MEM_SIZE];
uint8_t *command_mem;
uint32_t read_ptr;
uint32_t write_ptr;
uint32_t dealloc_ptr;
@ -330,7 +332,7 @@ class CommandQueueMT {
T *allocate() {
// alloc size is size+T+safeguard
uint32_t alloc_size = sizeof(T) + sizeof(uint32_t);
uint32_t alloc_size = ((sizeof(T) + 8 - 1) & ~(8 - 1)) + 8;
tryagain:
@ -360,7 +362,7 @@ class CommandQueueMT {
}
// if this happens, it's a bug
ERR_FAIL_COND_V((COMMAND_MEM_SIZE - write_ptr) < sizeof(uint32_t), NULL);
ERR_FAIL_COND_V((COMMAND_MEM_SIZE - write_ptr) < 8, NULL);
// zero means, wrap to beginning
uint32_t *p = (uint32_t *)&command_mem[write_ptr];
@ -372,12 +374,13 @@ class CommandQueueMT {
// Allocate the size and the 'in use' bit.
// First bit used to mark if command is still in use (1)
// or if it has been destroyed and can be deallocated (0).
uint32_t size = (sizeof(T) + 8 - 1) & ~(8 - 1);
uint32_t *p = (uint32_t *)&command_mem[write_ptr];
*p = (sizeof(T) << 1) | 1;
write_ptr += sizeof(uint32_t);
*p = (size << 1) | 1;
write_ptr += 8;
// allocate the command
T *cmd = memnew_placement(&command_mem[write_ptr], T);
write_ptr += sizeof(T);
write_ptr += size;
return cmd;
}
@ -415,7 +418,7 @@ class CommandQueueMT {
goto tryagain;
}
read_ptr += sizeof(uint32_t);
read_ptr += 8;
CommandBase *cmd = reinterpret_cast<CommandBase *>(&command_mem[read_ptr]);