Merge pull request #42981 from lyuma/command_queue_fix_3.2
[3.2] Backport Command queue fix
This commit is contained in:
commit
438e4f1e1a
2 changed files with 36 additions and 16 deletions
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@ -31,6 +31,7 @@
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#include "command_queue_mt.h"
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#include "core/os/os.h"
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#include "core/project_settings.h"
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void CommandQueueMT::lock() {
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@ -79,7 +80,7 @@ CommandQueueMT::SyncSemaphore *CommandQueueMT::_alloc_sync_sem() {
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bool CommandQueueMT::dealloc_one() {
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tryagain:
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if (dealloc_ptr == write_ptr) {
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if (dealloc_ptr == (write_ptr_and_epoch >> 1)) {
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// The queue is empty
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return false;
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}
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@ -103,22 +104,27 @@ tryagain:
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CommandQueueMT::CommandQueueMT(bool p_sync) {
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read_ptr = 0;
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write_ptr = 0;
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read_ptr_and_epoch = 0;
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write_ptr_and_epoch = 0;
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dealloc_ptr = 0;
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mutex = Mutex::create();
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command_mem = (uint8_t *)memalloc(COMMAND_MEM_SIZE);
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command_mem_size = GLOBAL_DEF_RST("memory/limits/command_queue/multithreading_queue_size_kb", DEFAULT_COMMAND_MEM_SIZE_KB);
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ProjectSettings::get_singleton()->set_custom_property_info("memory/limits/command_queue/multithreading_queue_size_kb", PropertyInfo(Variant::INT, "memory/limits/command_queue/multithreading_queue_size_kb", PROPERTY_HINT_RANGE, "1,4096,1,or_greater"));
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command_mem_size *= 1024;
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command_mem = (uint8_t *)memalloc(command_mem_size);
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for (int i = 0; i < SYNC_SEMAPHORES; i++) {
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sync_sems[i].sem = Semaphore::create();
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sync_sems[i].in_use = false;
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}
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if (p_sync)
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if (p_sync) {
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sync = Semaphore::create();
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else
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} else {
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sync = NULL;
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}
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}
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CommandQueueMT::~CommandQueueMT() {
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@ -311,15 +311,15 @@ class CommandQueueMT {
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/***** BASE *******/
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enum {
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COMMAND_MEM_SIZE_KB = 256,
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COMMAND_MEM_SIZE = COMMAND_MEM_SIZE_KB * 1024,
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DEFAULT_COMMAND_MEM_SIZE_KB = 256,
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SYNC_SEMAPHORES = 8
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};
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uint8_t *command_mem;
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uint32_t read_ptr;
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uint32_t write_ptr;
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uint32_t read_ptr_and_epoch;
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uint32_t write_ptr_and_epoch;
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uint32_t dealloc_ptr;
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uint32_t command_mem_size;
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SyncSemaphore sync_sems[SYNC_SEMAPHORES];
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Mutex *mutex;
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Semaphore *sync;
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@ -330,7 +330,11 @@ class CommandQueueMT {
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// alloc size is size+T+safeguard
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uint32_t alloc_size = ((sizeof(T) + 8 - 1) & ~(8 - 1)) + 8;
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// Assert that the buffer is big enough to hold at least two messages.
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ERR_FAIL_COND_V(alloc_size * 2 + sizeof(uint32_t) > command_mem_size, NULL);
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tryagain:
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uint32_t write_ptr = write_ptr_and_epoch >> 1;
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if (write_ptr < dealloc_ptr) {
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// behind dealloc_ptr, check that there is room
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@ -345,7 +349,7 @@ class CommandQueueMT {
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} else {
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// ahead of dealloc_ptr, check that there is room
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if ((COMMAND_MEM_SIZE - write_ptr) < alloc_size + sizeof(uint32_t)) {
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if ((command_mem_size - write_ptr) < alloc_size + sizeof(uint32_t)) {
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// no room at the end, wrap down;
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if (dealloc_ptr == 0) { // don't want write_ptr to become dealloc_ptr
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@ -358,12 +362,17 @@ class CommandQueueMT {
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}
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// if this happens, it's a bug
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ERR_FAIL_COND_V((COMMAND_MEM_SIZE - write_ptr) < 8, NULL);
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ERR_FAIL_COND_V((command_mem_size - write_ptr) < 8, NULL);
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// zero means, wrap to beginning
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uint32_t *p = (uint32_t *)&command_mem[write_ptr];
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*p = 0;
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write_ptr = 0;
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*p = 1;
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write_ptr_and_epoch = 0 | (1 & ~write_ptr_and_epoch); // Invert epoch.
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// See if we can get the thread to run and clear up some more space while we wait.
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// This is required if alloc_size * 2 + 4 > COMMAND_MEM_SIZE
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if (sync) {
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sync->post();
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}
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goto tryagain;
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}
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}
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@ -377,6 +386,7 @@ class CommandQueueMT {
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// allocate the command
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T *cmd = memnew_placement(&command_mem[write_ptr], T);
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write_ptr += size;
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write_ptr_and_epoch = (write_ptr << 1) | (write_ptr_and_epoch & 1);
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return cmd;
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}
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@ -402,17 +412,19 @@ class CommandQueueMT {
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tryagain:
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// tried to read an empty queue
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if (read_ptr == write_ptr) {
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if (read_ptr_and_epoch == write_ptr_and_epoch) {
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if (p_lock) unlock();
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return false;
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}
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uint32_t read_ptr = read_ptr_and_epoch >> 1;
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uint32_t size_ptr = read_ptr;
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uint32_t size = *(uint32_t *)&command_mem[read_ptr] >> 1;
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if (size == 0) {
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*(uint32_t *)&command_mem[read_ptr] = 0; // clear in-use bit.
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//end of ringbuffer, wrap
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read_ptr = 0;
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read_ptr_and_epoch = 0 | (1 & ~read_ptr_and_epoch); // Invert epoch.
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goto tryagain;
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}
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@ -422,6 +434,8 @@ class CommandQueueMT {
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read_ptr += size;
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read_ptr_and_epoch = (read_ptr << 1) | (read_ptr_and_epoch & 1);
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if (p_lock) unlock();
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cmd->call();
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if (p_lock) lock();
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