Replace debugger PAL waits with cross-platform wait types

src/coreclr/debug/debug-pal/CMakeLists.txt

@@ -1,5 +1,6 @@
 include_directories(../inc)
 include_directories(../../pal/inc)
+include_directories(${CLR_SRC_NATIVE_DIR})
 
 add_definitions(-DFEATURE_CORECLR)
 add_definitions(-DFEATURE_PERFTRACING)
@@ -11,16 +12,18 @@ if(CLR_CMAKE_HOST_WIN32)
 
     if(CLR_CMAKE_TARGET_WIN32)
         set(DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER ON)
-        set(TWO_WAY_PIPE_SOURCES
+        set(DEBUG_PAL_SOURCES
             ${EVENTPIPE_PAL_SOURCES}
             win/twowaypipe.cpp
             win/processdescriptor.cpp
         )
     else(CLR_CMAKE_TARGET_WIN32)
-        set(TWO_WAY_PIPE_SOURCES
+        set(DEBUG_PAL_SOURCES
             dummy/twowaypipe.cpp
         )
     endif(CLR_CMAKE_TARGET_WIN32)
+
+    list(APPEND DEBUG_PAL_SOURCES win/wait.cpp)
 endif(CLR_CMAKE_HOST_WIN32)
 
 if(CLR_CMAKE_HOST_UNIX)
@@ -36,15 +39,30 @@ if(CLR_CMAKE_HOST_UNIX)
 
     include_directories(../../inc) # for volatile.h
 
-    set(TWO_WAY_PIPE_SOURCES
+    set(DEBUG_PAL_SOURCES
       ${EVENTPIPE_PAL_SOURCES}
       unix/twowaypipe.cpp
       unix/processdescriptor.cpp
     )
 
+    if (NOT CLR_CMAKE_TARGET_ARCH_WASM)
+        list(APPEND DEBUG_PAL_SOURCES unix/wait.cpp)
+        # Strict POSIX mode hides pipe2 on BSD even when the platform supports it.
+        set_property(SOURCE unix/wait.cpp APPEND PROPERTY COMPILE_OPTIONS -U_POSIX_C_SOURCE)
+    endif()
+
 endif(CLR_CMAKE_HOST_UNIX)
 
-add_library_clr(debug-pal OBJECT ${TWO_WAY_PIPE_SOURCES})
+add_library_clr(debug-pal OBJECT ${DEBUG_PAL_SOURCES})
+target_link_libraries(debug-pal PRIVATE minipal)
+
+if(CLR_CMAKE_HOST_UNIX)
+    if(HAVE_PIPE2)
+        target_compile_definitions(debug-pal PRIVATE HAVE_PIPE2=1)
+    else()
+        target_compile_definitions(debug-pal PRIVATE HAVE_PIPE2=0)
+    endif()
+endif(CLR_CMAKE_HOST_UNIX)
 
 if (DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER)
     target_link_libraries(debug-pal PRIVATE dn-diagnosticserver-pal)