[latent-see] Improve visibility of party wakeups (#38053)

Just used this to find out we always do a tcp write for client initial metadata prior to payload

Closes #38053

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/38053 from ctiller:party-see 6b5a2ba6cf
PiperOrigin-RevId: 696371772

src/core/lib/promise/party.cc

@@ -357,6 +357,7 @@ void Party::RunPartyAndUnref(uint64_t prev_state) {
 }
 
 void Party::AddParticipants(Participant** participants, size_t count) {
+  GRPC_LATENT_SEE_INNER_SCOPE("Party::AddParticipants");
   uint64_t state = state_.load(std::memory_order_acquire);
   uint64_t allocated;
 
@@ -400,6 +401,7 @@ void Party::AddParticipants(Participant** participants, size_t count) {
 }
 
 void Party::AddParticipant(Participant* participant) {
+  GRPC_LATENT_SEE_INNER_SCOPE("Party::AddParticipant");
   uint64_t state = state_.load(std::memory_order_acquire);
   uint64_t allocated;
   size_t slot;
@@ -468,6 +470,7 @@ void Party::WakeupAsync(WakeupMask wakeup_mask) {
         wakeup_mask_ |= wakeup_mask;
         arena_->GetContext<grpc_event_engine::experimental::EventEngine>()->Run(
             [this, prev_state]() {
+              GRPC_LATENT_SEE_PARENT_SCOPE("Party::WakeupAsync");
               ApplicationCallbackExecCtx app_exec_ctx;
               ExecCtx exec_ctx;
               RunLockedAndUnref(this, prev_state);

src/core/lib/promise/party.h

@@ -342,6 +342,7 @@ class Party : public Activity, private Wakeable {
 
   // Wakeable implementation
   void Wakeup(WakeupMask wakeup_mask) final {
+    GRPC_LATENT_SEE_INNER_SCOPE("Party::Wakeup");
     if (Activity::current() == this) {
       wakeup_mask_ |= wakeup_mask;
       Unref();
@@ -352,6 +353,7 @@ class Party : public Activity, private Wakeable {
 
   GPR_ATTRIBUTE_ALWAYS_INLINE_FUNCTION void WakeupFromState(
       uint64_t cur_state, WakeupMask wakeup_mask) {
+    GRPC_LATENT_SEE_INNER_SCOPE("Party::WakeupFromState");
     DCHECK_NE(wakeup_mask & kWakeupMask, 0u)
         << "Wakeup mask must be non-zero: " << wakeup_mask;
     while (true) {

src/core/lib/surface/client_call.cc

@@ -184,6 +184,7 @@ void ClientCall::CancelWithError(grpc_error_handle error) {
 
 template <typename Batch>
 void ClientCall::ScheduleCommittedBatch(Batch batch) {
+  GRPC_LATENT_SEE_INNER_SCOPE("ClientCall::ScheduleCommittedBatch");
   auto cur_state = call_state_.load(std::memory_order_acquire);
   while (true) {
     switch (cur_state) {
@@ -225,6 +226,7 @@ void ClientCall::ScheduleCommittedBatch(Batch batch) {
 }
 
 void ClientCall::StartCall(const grpc_op& send_initial_metadata_op) {
+  GRPC_LATENT_SEE_INNER_SCOPE("ClientCall::StartCall");
   auto cur_state = call_state_.load(std::memory_order_acquire);
   CToMetadata(send_initial_metadata_op.data.send_initial_metadata.metadata,
               send_initial_metadata_op.data.send_initial_metadata.count,
@@ -271,6 +273,7 @@ void ClientCall::StartCall(const grpc_op& send_initial_metadata_op) {
 
 void ClientCall::CommitBatch(const grpc_op* ops, size_t nops, void* notify_tag,
                              bool is_notify_tag_closure) {
+  GRPC_LATENT_SEE_INNER_SCOPE("ClientCall::CommitBatch");
   if (nops == 1 && ops[0].op == GRPC_OP_SEND_INITIAL_METADATA) {
     StartCall(ops[0]);
     EndOpImmediately(cq_, notify_tag, is_notify_tag_closure);

src/core/util/latent_see.h

@@ -35,6 +35,7 @@
 #include "absl/functional/function_ref.h"
 #include "absl/log/log.h"
 #include "absl/strings/string_view.h"
+#include "absl/types/optional.h"
 #include "src/core/util/per_cpu.h"
 #include "src/core/util/sync.h"